But animal sex is totally instinctive ; human being sex depends mainly on experiences after delivery .
Le Vay shows the way the human anatomy is profoundly afflicted with hormones, particularly during gestation, creating dramatic real distinctions when considering feminine and babies that are male. Therefore possibly the brain that is human profoundly suffering from its frequent shower in intercourse hormones, starting before delivery. We must test this hypothesis on animals since we cannot experiment with humans. And has now demonstrated an ability that changing the mix of intercourse hormones at the beginning of the fetal growth of a animal will significantly affect the growth of their intimate organs and its own subsequent intimate behavior.