ABSTRACT
In Homo sapiens, there are 23 pairs of chromosomes, for a total of 46. One pair of the 23 consists of the sex chromosomes, the only chromosomes that differ between man and woman. Sexual differentiation leads not only to the formation of the sex organs as such, but also to the formation of other parts of the body that are less directly related to sex, such as the breasts. The male-female difference is visible externally and consists in a dissymmetry: one of the organs is hollow and the other is in relief. Anthropological evidence indicates that female orgasms are just as elusive in cultures other than our own and they are even more rare in the animal world. According to Donald Symons, homosexuality actually allows one to observe male and female sexuality in their purest forms. For heterosexuality implies a sort of compromise between the two partners; homosexuality does not.
