The biological bases of the female organism have been the subject of intense scientific debate in recent years. Many hypotheses have been proposed from evolutionary biology, for example that it is an adaptation that influences the choice of a partner, strengthens the links between both sexes or helps introduce sperm into the uterus. Another theory holds that the female orgasm is a by-product of the male orgasm, and that women orgasm for the same reason that men have nipples. In a study published in the latest issue of the journal Animal Behavior , Brendan Zietsch, from the University of Queensland (Australia), has tried to test this theory assuming that, if it were true, twins of the opposite sex and the set of Siblings would share more similarities in their susceptibility to orgasm – "orgasmobility" according to Zietsch – than unrelated couples.
Genetic analyzes revealed that identical same-sex twins had greater orgasmic similarity than non-identical same-sex twins. However, twins of the opposite sex and normal siblings had virtually no correlation in their susceptibility to orgasm. This assumes that the genes that influence orgasm function in men are not the same as those in women , according to Zietsch. In other words, everything points to the fact that the male and female orgasm evolved through different genetic routes. For now, the role of the female orgasm remains unknown.
