An exotic dancer performs in a street during an "Urban intervention" publicity event for an adult club in Santiago, Chile, January 26, 2016. REUTERS/Ivan Alvarado 

A tout (C) walks in front of a car advertising a strip club in Shinjuku's nightlife district of Kabukicho in Tokyo, August 27, 2015. REUTERS/Thomas Peter 

A woman takes a picture of participants performing during the "Perfect pole" pole dance championship of North Caucasus Federal District at the "Onegin" restaurant in Stavropol, southern Russia, November 9, 2014. Picture taken November 9, 2014. REUTERS/Eduard Korniyenko (RUSSIA - Tags: SOCIETY SPORT) 

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) 

A woman wears spiked stilettos as she practises a pole dancing move during an International Women's Day event at a women's-only pole dancing fitness studio called Studio Exclusive, in Sydney March 8, 2014. The event raised money for "White Ribbon" Australia, a campaign to stop violence against women. On March 8, activists around the globe celebrate International Women's Day, which dates back to the beginning of the 20th Century and has been observed by the United Nations since 1975. The U.N. writes that it is an occasion to commemorate achievements in women's rights and to call for further change. REUTERS/Jason Reed (AUSTRALIA - Tags: SOCIETY ANNIVERSARY HEALTH) 

Instructor Peta Howlett practices her moves during an International Women's Day event at a women's-only pole dancing fitness studio called Studio Exclusive, in Sydney March 8, 2014. The event raised money for "White Ribbon" Australia, a campaign to stop violence against women. On March 8, activists around the globe celebrate International Women's Day, which dates back to the beginning of the 20th Century and has been observed by the United Nations since 1975. The U.N. writes that it is an occasion to commemorate achievements in women's rights and to call for further change. REUTERS/Jason Reed (AUSTRALIA - Tags: SOCIETY ANNIVERSARY HEALTH) 

A woman practises a pole dancing move during an International Women's Day event at a women's-only pole dancing fitness studio called Studio Exclusive, in Sydney March 8, 2014. The event raised money for "White Ribbon" Australia, a campaign to stop violence against women. On March 8, activists around the globe celebrate International Women's Day, which dates back to the beginning of the 20th Century and has been observed by the United Nations since 1975. The U.N. writes that it is an occasion to commemorate achievements in women's rights and to call for further change. REUTERS/Jason Reed (AUSTRALIA - Tags: SOCIETY ANNIVERSARY HEALTH) 

An exotic dancer performs outside a bar window on Columbus Avenue during a funeral procession to symbolize the closure of Lusty Lady strip club in San Francisco, California September 1, 2013. United States' first and only unionized, employee-owned strip club shuts its doors on September 2 after its landlord refused to negotiate on a lower rent, local media reported Picture taken September 1, 2013. REUTERS/Stephen Lam (UNITED STATES - Tags: BUSINESS SOCIETY) 

A pair of silver heels is seen in a locker backstage at the Lusty Lady strip club in San Francisco, California September 2, 2013. United States' first and only unionized, employee-owned strip club shuts its doors on September 2 after its landlord refused to negotiate on a lower rent, local media reported. REUTERS/Stephen Lam (UNITED STATES - Tags: BUSINESS SOCIETY) 

A group of exotic dancers relax backstage at the Lusty Lady strip club in San Francisco, California September 2, 2013. United States' first and only unionized, employee-owned strip club shuts its doors on September 2 after its landlord refused to negotiate on a lower rent, local media reported. REUTERS/Stephen Lam (UNITED STATES - Tags: BUSINESS SOCIETY) 

An exotic dancer is pictured wearing silver-colored eyelashes outside the Lusty Lady strip club in San Francisco, California September 1, 2013. United States' first and only unionized, employee-owned strip club shuts its doors on September 2 after its landlord refused to negotiate on a lower rent, local media reported. Picture taken September 1, 2013. REUTERS/Stephen Lam (UNITED STATES - Tags: BUSINESS SOCIETY) 

Instructor Gladis Oliva teaches a class at the "Vertical" pole dance academy in Guadalupe, on the outskirts of Monterrey, July 18, 2013. Gladis is six-months pregnant and plans to teach until the end of July. REUTERS/Daniel Becerril (MEXICO - Tags: SOCIETY) 

A pole dance instructor gives a free lesson during the Erotika Fair in Sao Paulo April 4, 2013. Around 30,000 visitors are expected to visit the largest Latino erotic fair which will run from April 4 to 7, according to its organisers. REUTERS/Paulo Whitaker (BRAZIL - Tags: SOCIETY ENTERTAINMENT) 

Participant Luisa Ortiz competes in the annual Colombian pole dancing contest in Medellin September 28, 2012. REUTERS/Albeiro Lopera (COLOMBIA - Tags: SOCIETY) 

Nikolett Molnar competes in the Hungarian pole dance competition in Budapest, September 22, 2012. REUTERS/Laszlo Balogh (HUNGARY - Tags: SOCIETY) 

Eszter Szlavi warms up before starting the Hungarian pole dance competition in Budapest, September 22, 2012. REUTERS/Laszlo Balogh (HUNGARY - Tags: SOCIETY) 

A strip dancer performs for customers at the Mons Venus strip club in Tampa, Florida, August 3, 2012. REUTERS/Brian Blanco (UNITED STATES - Tags: ENTERTAINMENT SOCIETY) 

A strip dancer performs for customers at the Mons Venus strip club in Tampa, Florida, August 3, 2012. REUTERS/Brian Blanco (UNITED STATES - Tags: ENTERTAINMENT SOCIETY) 

A strip dancer performs a lap dance for a customer at the Mons Venus strip club in Tampa, Florida, August 3, 2012. REUTERS/Brian Blanco (UNITED STATES - Tags: ENTERTAINMENT SOCIETY) 

Strip dancers mingle with customers at the Mons Venus strip club in Tampa, Florida, August 3, 2012. REUTERS/Brian Blanco (UNITED STATES - Tags: ENTERTAINMENT SOCIETY) 

A strip dancer mingles with a customer at the Mons Venus strip club in Tampa, Florida, August 3, 2012. REUTERS/Brian Blanco (UNITED STATES - Tags: ENTERTAINMENT SOCIETY) 

Contestant Yi Hui practices for the 2nd China Pole Dance semi-final in Tianjin municipality, June 2, 2012. REUTERS/Jason Lee (CHINA - Tags: SOCIETY) 

Contestant Yu Wen competes during the 2nd China Pole Dance semi-final in Tianjin municipality, June 2, 2012. REUTERS/Jason Lee (CHINA - Tags: SOCIETY) 

Contestant Liu Duoduo competes during the 2nd China Pole Dance semi-final in Tianjin municipality, June 2, 2012. REUTERS/Jason Lee (CHINA - Tags: SOCIETY) 

Contestant Zhu Wen competes during the 2nd China Pole Dance semi-final in Tianjin municipality, June 2, 2012. REUTERS/Jason Lee (CHINA - Tags: SOCIETY TPX IMAGES OF THE DAY) 

Sun Fengqin (R), 60, stretches with her instructor during a pole dancing class in Nanjing, Jiangsu province April 27, 2012. In China, where older women are expected to lead a quiet life tending to their grandchildren, retired grandmother Sun's hobby is unusual - she pole dances. Swings, spins and sultry moves are all in the repertoire of the long-haired 60-year-old, who took on pole dancing in admiration of what she saw as a sexy sport despite its image in China as something associated with strip club. Pole dancing has over the last few years evolved into a popular past time and way of staying in shape, with practioners promoting it as a legitimate form of dance and acrobatics. REUTERS/Carlos Barria (CHINA - Tags: SOCIETY) 

Sun Fengqin (L), 60, participates in a pole-dancing class in Nanjing, Jiangsu province, April 27, 2012. In China, where older women are expected to lead a quiet life tending to their grandchildren, retired grandmother Sun Fengqin's hobby is unusual - she pole dances. Swings, spins and sultry moves are all in the repertoire of the long-haired 60-year-old, who took on pole dancing in admiration of what she saw as a sexy sport despite its image in China as something associated with strip clubs. Pole dancing has over the last few years evolved into a popular pastime and a way of staying in shape, with devotees promoting it as a legitimate form of dance and acrobatics. Picture taken April 27, 2012. REUTERS/Carlos Barria (CHINA - Tags: SOCIETY) 

Sun Fengqin, 60, participates in a pole-dancing class in Nanjing, Jiangsu province, April 27, 2012. In China, where older women are expected to lead a quiet life tending to their grandchildren, retired grandmother Sun Fengqin's hobby is unusual - she pole dances. Swings, spins and sultry moves are all in the repertoire of the long-haired 60-year-old, who took on pole dancing in admiration of what she saw as a sexy sport despite its image in China as something associated with strip clubs. Pole dancing has over the last few years evolved into a popular pastime and a way of staying in shape, with devotees promoting it as a legitimate form of dance and acrobatics. Picture taken April 27, 2012. REUTERS/Carlos Barria (CHINA - Tags: SOCIETY) 

Audrey (R) and Daisy perform a free holiday themed lap dance for Brian MacDonald after he donated a child's toy at the Admiral Theatre in Chicago, December 15, 2011. The strip club is collecting toys for a Christmas Charity through to December 17. REUTERS/John Gress (UNITED STATES - Tags: SOCIETY) 

Alesia Vazmitsel of Belarus competes during the World Pole Dance final in Budapest October 1, 2011. REUTERS/Laszlo Balogh (HUNGARY - Tags: SOCIETY) 

Jill Anne performs during the Mermaid Parade at Coney Island in the Brooklyn section of New York June 18, 2011. REUTERS/Jessica Rinaldi (UNITED STATES - Tags: SOCIETY) 

Natasha Wang (L) runs through her routine as Heidi Coker looks on at the US Pole Dance Championships in New York City April 29, 2011. Participants were judged on a self-choreographed routine that included compulsory stunts. REUTERS/Jessica Rinaldi (UNITED STATES - Tags: SOCIETY SPORT) 

Contestants pose for a picture while another warms up before the finals of the Miss Pole Dancing Argentina and Sudamerica 2010 contest in Buenos Aires November 6, 2010. Finalists selected from around the region took part in the event, with 10 competing in the amateur category and 16 in the professional category. REUTERS/Enrique Marcarian (ARGENTINA - Tags: SOCIETY SPORT) 

Professional pole dancer Elizabeth Munoz of Peru performs her routine in the Miss Pole Dancing Argentina and Sudamerica 2010 competition in Buenos Aires November 6, 2010. Munoz won the title of Miss Pole Dancing Sudamerica 2010 in the professional category, beating 15 other finalists selected from around the region. REUTERS/Enrique Marcarian (ARGENTINA - Tags: SOCIETY SPORT) 

Professional pole dancer Daniela Shmoll performs her out-of-competition routine in the finals of the Miss Pole Dancing Argentina and Sudamerica 2010 competition in Buenos Aires November 6, 2010. Finalists selected from around the region took part in the event, with 10 competing in the amateur category and 16 in the professional category. REUTERS/Enrique Marcarian (ARGENTINA - Tags: SOCIETY SPORT) 

Professional pole dancer Elizabeth Munoz of Peru does her routine in the finals of the Miss Pole Dancing Argentina and Sudamerica 2010 competition in Buenos Aires November 6, 2010. Munoz won the title of Miss Pole Dancing Sudamerica 2010 in the professional category, beating 15 other finalists selected from around the region. REUTERS/Enrique Marcarian (ARGENTINA - Tags: SOCIETY SPORT) 

A contestant waits for her turn to perform in the finals of the Miss Pole Dancing Argentina and Sudamerica 2010 competition in Buenos Aires November 6, 2010. Finalists selected from around the region took part in the event, with 10 competing in the amateur category and 16 in the professional category. REUTERS/Enrique Marcarian (ARGENTINA - Tags: SOCIETY SPORT IMAGES OF THE DAY) 

Men take pictures of an exotic dancer during Expo Erotica 2010 in Tijuana August 13, 2010. REUTERS/Jorge Duenes (MEXICO - Tags: SOCIETY) 

A dancing coach demonstrates a move for his students during a training session at a pole dancing school in Hefei, Anhui province July 26, 2010. More than 90 students, mostly young women, have signed up for classes in this school, to get fit or to train to be a pole dancing coach, local media reported. Picture taken July 26, 2010. REUTERS/Stringer (CHINA - Tags: SOCIETY) 

Dance students take part in a training session at a pole dancing school in Hefei, Anhui province July 26, 2010. More than 90 students, mostly young women, have signed up for classes in this school, to get fit or to train to be a pole dancing coach, local media reported. Picture taken July 26, 2010. REUTERS/Stringer (CHINA - Tags: SOCIETY) 

Dance students take part in a training session at a pole dancing school in Hefei, Anhui province July 26, 2010. More than 90 students, mostly young women, have signed up for classes in this school, to get fit or to train to be a pole dancing coach, local media reported. Picture taken July 26, 2010. REUTERS/Stringer (CHINA - Tags: SOCIETY IMAGES OF THE DAY) 

Dancers wait for customers at Patpong street in Bangkok April 21, 2010. Thailand's "red shirt" protesters called off a march to Bangkok's business district on Tuesday after a stern warning from the army, but they threatened to stay in the capital's shopping district "indefinitely". REUTERS/Chaiwat Subprasom (THAILAND - Tags: POLITICS) 

A dancer wearing lingerie performs during a celebration ahead of Valentine's Day at a club in Faqra, Mount Lebanon, late February 12, 2010. REUTERS/ Wadih Shlink (LEBANON - Tags: ENTERTAINMENT) 

A show girl performs at the Erotica Dream exhibition in Nice, southeastern France October 3, 2009. REUTERS/Eric Gaillard (FRANCE) 

People wait in line to speak with recruiting representatives during a job fair in San Francisco, California, July 20, 2009. Hundreds of people applied for 30 jobs as bartenders, exotic dancers and waitresses at several San Francisco strip clubs. REUTERS/Robert Galbraith (UNITED STATES BUSINESS SOCIETY) 

Chamika Chandler (L) waits to be interviewed for a waitress or bartender position at a job fair at the Foxy Lady Gentleman's Club in Providence, Rhode Island March 21, 2009. The club is looking to hire entertainers, bartenders, floor hosts and disc jockeys. REUTERS/Brian Snyder (UNITED STATES BUSINESS) 

Arlyne Chinn tries out a new move during an intermediate pole dancing class at Flirty Girl Fitness in Chicago February 17, 2009. As the economy struggles, the club has partnered with other business to offer discounts to members, in order to drive business to both the gym and its affiliates. REUTERS/John Gress (UNITED STATES) 

Rachel Karabenick (L) and Arlyne Chinn try out a new move during an intermediate pole dancing class at Flirty Girl Fitness in Chicago February 17, 2009. As the economy struggles, the club has partnered with other business to offer discounts to members, in order to drive business to both the gym and its affiliates. REUTERS/John Gress (UNITED STATES) 

Diana Douglas (L) cheers on Amma Nantwi during an intermediate pole dancing class at Flirty Girl Fitness in Chicago February 17, 2009. As the economy struggles, the club has partnered with other business to offer discounts to members, in order to drive business to both the gym and its affiliates. REUTERS/John Gress (UNITED STATES) 

Women participate in an advanced pole dancing class at Flirty Girl Fitness in Chicago February 17, 2009. As the economy struggles, the club has partnered with other business to offer discounts to members, in order to drive business to both the gym and its affiliates. REUTERS/John Gress (UNITED STATES) 

Women, including Diana Douglas (C), participate in an advanced pole dancing class at Flirty Girl Fitness in Chicago February 17, 2009. As the economy struggles, the club has partnered with other business to offer discounts to members, in order to drive business for both the gym and its affiliates. REUTERS/John Gress (UNITED STATES) 

A pole dancer performs during a show in the northern Indian city of Lucknow February 4, 2009. The show was organised to promote pole dancing in India, the organisers said. Picture taken February 4, 2009. REUTERS/Pawan Kumar (INDIA) 

An instructor displays a routine during a workshop at a pole dancing studio in Singapore November 28, 2008. The workshop was held as part of the Asian Pole Summit, which brings together pole dancing students and performers to practice and display their skills. REUTERS/Vivek Prakash (SINGAPORE) 

Students practice routines while attending a workshop at a pole dancing studio in Singapore November 28, 2008. The workshop was held as part of the Asian Pole Summit, which brings together pole dancing students and performers to practice and display their skills. REUTERS/Vivek Prakash (SINGAPORE) 

A woman performs a pole dancing routine during a competition at a nightclub in Singapore November 27, 2008. The display was held as part of the inaugural Asian Pole Summit, which brings together pole dancing performers and students from around the region to practice and display their skills. REUTERS/Vivek Prakash (SINGAPORE)