A mock copulating couple is displayed at the exhibition "Sex and Evolution" at the Natural History museum in the western city of Muenster October 17, 2013. The exhibiton, which features animals mating and examines how sex in the plant and animal kingdoms plays the main role in evolution, runs from October 11 until October 19, 2014. REUTERS/Ina Fassbender (GERMANY - Tags: SOCIETY) EDUCATION ENTERTAINMENT)