Adult video actress Yuri Oshikawa checks her script as another actor sits behind a camera during a rehearsal for ROCKET's 3D virtual reality adult film at the company's studio in Tokyo, Japan, July 31, 2017. REUTERS/Kim Kyung-Hoon SEARCH "PORN VR" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Italian pornographic film star Rocco Siffredi poses with his wife Rosza Tassi as they attend the carpet for the movie "Rocco" at the 73rd Venice Film Festival in Venice, Italy September 5, 2016. REUTERS/Alessandro Bianchi 

Italian pornographic film star Rocco Siffredi poses with his wife Rosza Tassi as they attend the carpet for the movie "Rocco" at the 73rd Venice Film Festival in Venice, Italy September 5, 2016. REUTERS/Alessandro Bianchi 

Porn actresses take a break at the Venus erotic fair in Berlin, Germany, October 15, 2015. The event, which represents the erotic business in the German capital, is open till October 18, 2015. REUTERS/Fabrizio Bensch 

Porn actresses take a break at the Venus erotic fair in Berlin, Germany, October 15, 2015. The event, which represents the erotic business in the German capital, is open till October 18, 2015. REUTERS/Fabrizio Bensch 

Porn actresses line-up at the opening of the Venus Erotic fair, Germany, October 15, 2015. The event, which represents the erotic business in the German capital, is open till October 18, 2015. REUTERS/Fabrizio Bensch TPX IMAGES OF THE DAY

Model Svetlana Ivanova poses during the "Sex and Entertainment" adult exhibition in Mexico City July 19, 2015. Exotic dancers, strippers and adult movie actors and actresses present new trends of the erotic and porn industry at the three-day event. REUTERS/Henry Romero 

An exotic dancer performs during the "Sex and Entertainment" adult exhibition in Mexico City July 19, 2015. Exotic dancers, strippers and adult movie actors and actresses present new trends of the erotic and porn industry at the three-day event. REUTERS/Henry Romero 

People take pictures with their mobile phones of an exotic dancer during the "Sex and Entertainment" adult exhibition in Mexico City July 19, 2015. Exotic dancers, strippers and adult movie actors and actresses present new trends of the erotic and porn industry at the three-day event. REUTERS/Henry Romero 

An exotic dancer performs during the 'Sexo and Entertainment' adult exhibition in Mexico City July 19, 2015. Exotic dancers, strippers and adult movie actors and actresses present new trends of the erotic and porn industry at the three-day event. REUTERS/Henry Romero 

An exotic dancer poses for a photo while wearing wristbands that indicate the number of photos she took with men at the "Sexo and Entertainment" adult exhibition in Mexico City October 31, 2014. Exotic dancers, strippers and adult movie actors and actresses present new trends of the erotic and porn industry at the three-day event. REUTERS/Edgard Garrido (MEXICO - Tags: SOCIETY) 

Audience members take photographs of exotic dancers performing during the "Sexo and Entertainment" adult exhibition in Mexico City October 31, 2014. Exotic dancers, strippers and adult movie actors and actresses present new trends of the erotic and porn industry at the three-day event. REUTERS/Edgard Garrido (MEXICO - Tags: SOCIETY) 

An exotic dancer poses for pictures with a man during the "Sexo and Entertainment" adult exhibition in Mexico City October 31, 2014. Exotic dancers, strippers and adult movie actors and actresses present new trends of the erotic and porn industry at the three-day event. REUTERS/Edgard Garrido (MEXICO - Tags: SOCIETY) 

A man looks at an exotic dancer during the 'Sexo and Entertainment' adult exhibition in Mexico City October 31, 2014. Exotic dancers, strippers and adult movie actors and actresses present new trends of the erotic and porn industry at the three-day event. REUTERS/Edgard Garrido (MEXICO - Tags: SOCIETY) 

A man takes picture of an exotic dancer during the 'Sexo and Entertainment' adult exhibition in Mexico City October 31, 2014. Exotic dancers, strippers and adult movie actors and actresses present new trends of the erotic and porn industry at the three-day event. REUTERS/Edgard Garrido (MEXICO - Tags: SOCIETY) 

An exotic dancer performs next to a sign during the "Sexo and Entertainment" adult exhibition in Mexico City October 31, 2014. Exotic dancers, strippers and adult movie actors and actresses present new trends of the erotic and porn industry at the three-day event. The sign show a price list for photos taken with the dancer, and products such as lighters, movies and calendars. REUTERS/Edgard Garrido (MEXICO - Tags: SOCIETY) 

Exotic dancers speak in their performance space during the "Sexo and Entertainment" adult exhibition in Mexico City October 31, 2014. Exotic dancers, strippers and adult movie actors present new trends of the erotic and porn industry at the three-day event. REUTERS/Edgard Garrido (MEXICO - Tags: SOCIETY) 

Exotic dancers perform during the "Sexo and Entertainment" adult exhibition in Mexico City October 31, 2014. Exotic dancers, strippers and adult movie actors present new trends of the erotic and porn industry at the three-day event. REUTERS/Edgard Garrido (MEXICO - Tags: SOCIETY) 

Porn actresses line-up at the opening of the "Venus" erotic fair in Berlin October 17, 2013. The event, which represents the erotic business in the German capital, is open till October 20, 2013. REUTERS/Fabrizio Bensch (GERMANY - Tags: SOCIETY ENTERTAINMENT) 

A woman walks her dog past the headquarters of pornographic film production company Vivid Entertainment Group in Los Angeles, California January 11, 2013. Top adult film producer Vivid Entertainment sued Los Angeles County and its health director on Friday over a voter-approved measure requiring porn actors to wear condoms, saying the law infringes on their First Amendment rights and is driving the industry out of California. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT POLITICS SOCIETY BUSINESS LOGO ANIMALS) 

A view shows the sign for pornographic film production company Vivid Entertainment Group at its headquarters in Los Angeles, California January 11, 2013. Top adult film producer Vivid Entertainment sued Los Angeles County and its health director on Friday over a voter-approved measure requiring porn actors to wear condoms, saying the law infringes on their First Amendment rights and is driving the industry out of California. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT POLITICS SOCIETY BUSINESS LOGO) 

A view shows the headquarters of pornographic film production company Vivid Entertainment Group in Los Angeles, California January 11, 2013. Top adult film producer Vivid Entertainment sued Los Angeles County and its health director on Friday over a voter-approved measure requiring porn actors to wear condoms, saying the law infringes on their First Amendment rights and is driving the industry out of California. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT POLITICS SOCIETY BUSINESS LOGO) 

A view shows the headquarters of pornographic film production company Vivid Entertainment Group in Los Angeles, California January 11, 2013. Top adult film producer Vivid Entertainment sued Los Angeles County and its health director on Friday over a voter-approved measure requiring porn actors to wear condoms, saying the law infringes on their First Amendment rights and is driving the industry out of California. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT POLITICS SOCIETY BUSINESS LOGO) 

The logo of pornographic film production company Vivid Entertainment Group is seen on the building of its headquarters in Los Angeles, California January 11, 2013. Top adult film producer Vivid Entertainment sued Los Angeles County and its health director on Friday over a voter-approved measure requiring porn actors to wear condoms, saying the law infringes on their First Amendment rights and is driving the industry out of California. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT POLITICS SOCIETY BUSINESS LOGO) 

A view shows the headquarters of pornographic film production company Vivid Entertainment Group in Los Angeles, California January 11, 2013. Top adult film producer Vivid Entertainment sued Los Angeles County and its health director on Friday over a voter-approved measure requiring porn actors to wear condoms, saying the law infringes on their First Amendment rights and is driving the industry out of California. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT POLITICS SOCIETY BUSINESS LOGO) 

The logo of pornographic film production company Vivid Entertainment Group is seen on the building of its headquarters in Los Angeles, California January 11, 2013. Top adult film producer Vivid Entertainment sued Los Angeles County and its health director on Friday over a voter-approved measure requiring porn actors to wear condoms, saying the law infringes on their First Amendment rights and is driving the industry out of California. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT POLITICS SOCIETY BUSINESS LOGO) 

Exotic dancers pose for photographers and spectators during the 'Sexo and Entertainment' adult exhibition in Monterrey September 1, 2012. Exotic dancers, strippers and adult movie actors and actresses from more than 25 countries present new trends of the erotic and porn industry at the four-day long "Sex and Entertainment 2012" fair. REUTERS/Daniel Becerril (MEXICO - Tags: SOCIETY) 

An exotic dancer walks past white platform Go Go boots during a news conference in Monterrey August 29, 2012. Exotic dancers, strippers and adult movie actors and actresses from over 25 countries will present new trends of the erotic and porn industry at the four-day long "Sex and Entertainment 2012" fair.
REUTERS/Daniel Becerril (MEXICO - Tags: SOCIETY) 

An adult movie actress poses during a news conference in Monterrey August 29, 2012. Exotic dancers, strippers and adult movie actors and actresses from over 25 countries will present new trends of the erotic and porn industry at the four-day long "Sex and Entertainment 2012" fair.
REUTERS/Daniel Becerril (MEXICO - Tags: SOCIETY PORTRAIT) 

An exotic dancer performs during a news conference in Monterrey August 29, 2012. Exotic dancers, strippers and adult movie actors and actresses from over 25 countries will present new trends of the erotic and porn industry at the four-day long "Sex and Entertainment 2012" fair.
REUTERS/Daniel Becerril (MEXICO - Tags: SOCIETY) 

An erotic dancer performs during a news conference in Monterrey August 29, 2012. Erotic dancers, strippers and adult movie actors and actresses from over 25 countries will present new trends of the erotic and porn industry at the four-day long "Sex and Entertainment 2012" fair.
REUTERS/Daniel Becerril (MEXICO - Tags: SOCIETY) 

The urn containing the ashes of Jun Lin sits in a funeral home prior to the funeral services in Montreal, July 26, 2012. According to the police, Porn Actor Luka Magnotta murdered Lin, dismembered his body and posted a gory video of the crime online. Magnotta faces first degree murder charges. REUTERS/Christinne Muschi (CANADA - Tags: CRIME LAW OBITUARY) 

Defence lawyers Jean Dury (L), Luc Leclair (R) and Pierre Panaccio (C) speak with the media following the court appearance of Luka Rocco Magnotta in Montreal June 21, 2012. A Montreal court on Thursday set the date March 11, 2013 for preliminary hearings in the case of Canadian porn actor Magnotta, accused of murdering a student, dismembering the body, mailing out body parts and then posting a video of the killing online. REUTERS/ Christinne Muschi (CANADA - Tags: CRIME LAW CIVIL UNREST) 

Crown prosecutors Helene Di Salvo (C) and Louis Bouthillier (R) leave the courtroom following the appearance of Luka Rocco Magnotta in Montreal, June 21, 2012. A Montreal court on Thursday set the date March 11, 2013 for preliminary hearings in the case of Canadian porn actor Magnotta, accused of murdering a student, dismembering the body, mailing out body parts and then posting a video of the killing online. REUTERS/ Christinne Muschi (CANADA - Tags: CRIME LAW CIVIL UNREST) 

Defence lawyers Jean Dury (L), Luc Leclair (C) and Pierre Panaccio speak with the media following the court appearance of Luka Rocco Magnotta in Montreal June 21, 2012. A Montreal court on Thursday set the date March 11, 2013 for preliminary hearings in the case of Canadian porn actor Magnotta, accused of murdering a student, dismembering the body, mailing out body parts and then posting a video of the killing online. REUTERS/ Christinne Muschi (CANADA - Tags: CRIME LAW CIVIL UNREST) 

A vehicle (3rd R) carrying porn movie actor Luka Rocco Magnotta is escorted out of Mirabel Airport by police in Mirabel, Quebec, June 18, 2012. Magnotta, 29, accused of first-degree murder in connection with the killing, dismembering and cannibalizing of a Chinese student in Montreal was flown back to Canada on Monday from Germany, where he was arrested. REUTERS/ Christinne Muschi (CANADA - Tags: CRIME LAW CIVIL UNREST ENTERTAINMENT) 

A vehicle carrying porn movie actor Luka Rocco Magnotta is escorted out at Mirabel Airport in Mirabel, Quebec, June 18, 2012. Magnotta, 29, accused of first-degree murder in connection with the killing, dismembering and cannibalizing of a Chinese student in Montreal was flown back to Canada on Monday from Germany, where he was arrested. REUTERS/Christinne Muschi (CANADA - Tags: CRIME LAW CIVIL UNREST) 

A vehicle (R) carrying porn movie actor Luka Rocco Magnotta is escorted out by police at Mirabel Airport in Mirabel, Quebec, June 18, 2012. Magnotta, 29, accused of first-degree murder in connection with the killing, dismembering and cannibalizing of a Chinese student in Montreal was flown back to Canada on Monday from Germany, where he was arrested. REUTERS/Christinne Muschi (CANADA - Tags: CRIME LAW CIVIL UNREST ENTERTAINMENT) 

The plane carrying porn movie actor Luka Rocco Magnotta lands at Mirabel Airport in Mirabel, Quebec, June 18, 2012. Magnotta, 29, accused of first-degree murder in connection with the killing, dismembering and cannibalizing of a Chinese student in Montreal was flown back to Canada on Monday from Germany, where he was arrested. REUTERS/Christinne Muschi (CANADA - Tags: CRIME LAW CIVIL UNREST ENTERTAINMENT) 

The cockpit of the plane carrying porn movie actor Luka Rocco Magnotta is pictured as the plane lands at Mirabel Airport in Mirabel, Quebec, June 18, 2012. Magnotta, 29, accused of first-degree murder in connection with the killing, dismembering and cannibalizing of a Chinese student in Montreal was flown back to Canada on Monday from Germany, where he was arrested. REUTERS/Christinne Muschi (CANADA - Tags: CRIME LAW CIVIL UNREST ENTERTAINMENT) 

A vehicle carrying porn movie actor Luka Rocco Magnotta (L) is escorted out by police at Mirabel Airport in Mirabel, Quebec, June 18, 2012. Magnotta, 29, accused of first-degree murder in connection with the killing, dismembering and cannibalizing of a Chinese student in Montreal was flown back to Canada on Monday from Germany, where he was arrested. REUTERS/Christinne Muschi (CANADA - Tags: CRIME LAW CIVIL UNREST ENTERTAINMENT) 

Montreal Police Commander Ian Lafreniere (L) walks past the van carrying porn movie actor Luka Rocco Magnotta as he is being escorted out at Mirabel Airport in Mirabel, Quebec, June 18, 2012. Magnotta, 29, accused of first-degree murder in connection with the killing, dismembering and cannibalizing of a Chinese student in Montreal was flown back to Canada on Monday from Germany, where he was arrested. REUTERS/Christinne Muschi (CANADA - Tags: CRIME LAW CIVIL UNREST ENTERTAINMENT) 

A vehicle (L) carrying porn movie actor Luka Rocco Magnotta is escorted out by police at Mirabel Airport in Mirabel, Quebec, June 18, 2012. Magnotta, 29, accused of first-degree murder in connection with the killing, dismembering and cannibalizing of a Chinese student in Montreal was flown back to Canada on Monday from Germany, where he was arrested. REUTERS/Christinne Muschi (CANADA - Tags: CRIME LAW CIVIL UNREST ENTERTAINMENT) 

The plane carrying porn movie actor Luka Rocco Magnotta lands at Mirabel Airport in Mirabel, Quebec, June 18, 2012. Magnotta, 29, accused of first-degree murder in connection with the killing, dismembering and cannibalizing of a Chinese student in Montreal was flown back to Canada on Monday from Germany, where he was arrested. REUTERS/Christinne Muschi (CANADA - Tags: CRIME LAW CIVIL UNREST ENTERTAINMENT) 

3D glasses are seen at the stand for an adult television programme during the MIPTV, the International Television Programs Market, event in Cannes April 3, 2012. REUTERS/Eric Gaillard (FRANCE - Tags: ENTERTAINMENT BUSINESS) 

Japanese adult actress Saori Hara (2nd L) and actor Hayama Hiro (3rd L), both wearing 3D glasses, along with director Christopher Sun (4th L), watch a replay of their acting during the making of "3D Sex and Zen" in Hong Kong August 13, 2010. The producers are hoping the erotic period drama based in ancient China -- which is expected to open in Asian cinemas next year -- will prove a titillating hit with 3D-glasses-wearing audiences and develop a lucrative, niche market for pornography productions in future. Picture taken August 13, 2010. To match Reuters Life! HONGKONG 3DPORN REUTERS/Bobby Yip (CHINA - Tags: ENTERTAINMENT SCI TECH IMAGES OF THE DAY) 

Tila "Tequila" Nguyen poses for photographers at the 11th annual Maxim Hot 100 party in Los Angeles May 19, 2010. REUTERS/Phil McCarten (UNITED STATES - Tags: ENTERTAINMENT IMAGES OF THE DAY) 

Adult film star Mary Carey waves during the parade of eaters at "Wingbowl 18", the annual chicken wing eating contest in Philadelphia, Pennsylvania, February 5, 2010. About 18,000 people turned out before dawn on Friday for the 18th Wing Bowl, an eating competition dubbed the world's biggest, and an annual celebration of Philadelphia's raucous sports-crazed culture. Each competitor was attended by a posse of wingettes, scantily clad young women who fetched the wings and mopped the brows of the contestants to the delight of the overwhelmingly male crowd. To match Reuters Life! USA-WINGBOWL/ REUTERS/Tim Shaffer (UNITED STATES - Tags: SOCIETY ENTERTAINMENT) 

Porn stars Tarra White (L) and Jesse Jane pose for pictures at the official opening of Sexpo in Sydney October 29, 2009. Sexpo, an exhibition about sexuality and adult lifestyle will run from October 29 to November 1. REUTERS/Daniel Munoz (AUSTRALIA SOCIETY ENTERTAINMENT) 

Adult movie actress Axelle Parker poses during a photocall after a news conference to announce the Erotica Dream exhibition in Nice, southeastern France, October 1, 2009. The Erotica Dream exhibition is held in Nice from October 2 to 4. REUTERS/Eric Gaillard (FRANCE SOCIETY) 

Visitors take photos and videos of two performers during the 13th annual Erotica LA (ELA) at the Convention Center in Los Angeles June 14, 2009. The sexuality and lifestyle exposition runs June 12-14. REUTERS/Mario Anzuoni (UNITED STATES ENTERTAINMENT) 

Pornographic movie actor Shigeo Tokuda wears a kimono before the shooting of his latest film in Ichikawa, east of Tokyo, April 13, 2009. Tokuda is Japan's oldest pornographic movie star and is shooting his latest film in which he portrays a master of sex. REUTERS/Toru Hanai (JAPAN ENTERTAINMENT SOCIETY) 

Pornographic movie actor Shigeo Tokuda poses during the shooting of his latest film in Ichikawa, east of Tokyo, April 13, 2009. Tokuda is Japan's oldest pornographic movie star and is shooting his latest film in which he portrays a master of sex. REUTERS/Kim Kyung-Hoon (JAPAN ENTERTAINMENT SOCIETY) 

Pornographic movie actor Shigeo Tokuda poses during the shooting of his latest film in Ichikawa, east of Tokyo, April 13, 2009. Tokuda is Japan's oldest pornographic movie star and is shooting his latest film in which he portrays a master of sex. REUTERS/Kim Kyung-Hoon (JAPAN ENTERTAINMENT SOCIETY) 

Pornographic movie actor Shigeo Tokuda (R) takes a rest during the shooting of his latest film in Ichikawa, east of Tokyo, April 13, 2009. Tokuda is Japan's oldest pornographic movie star and is shooting his latest film in which he portrays a master of sex. To match REUTERS-LIFE! JAPAN-ELDERLY/PORN REUTERS/Kim Kyung-Hoon (JAPAN ENTERTAINMENT SOCIETY) 

Pornographic movie actor Shigeo Tokuda performs with an actress during the shooting of his latest film in Ichikawa, east of Tokyo, April 13, 2009. Tokuda is Japan's oldest pornographic movie star and is shooting his latest film in which he portrays a master of sex. To match REUTERS-LIFE! JAPAN-ELDERLY/PORN REUTERS/Toru Hanai (JAPAN ENTERTAINMENT SOCIETY) 

Pornographic movie actor Shigeo Tokuda (L) performs with actress Yuri Kuroda during the shooting of his latest film in Ichikawa, east of Tokyo, April 13, 2009. Tokuda is Japan's oldest pornographic movie star and is shooting his latest film in which he portrays a master of sex. To match REUTERS-LIFE! JAPAN-ELDERLY/PORN REUTERS/Toru Hanai (JAPAN ENTERTAINMENT SOCIETY)