German primatologists found that male Barbary macaques thrust more vigorously during sex if their female partners shout loudly, and that it is almost impossible for the male macaques to climax if the females do not shout.
German primatologists found that male Barbary macaques thrust more vigorously during sex if their female partners shout loudly, and that it is almost impossible for the male macaques to climax if the females do not shout.