And does the same thing happen to women’s ovaries? And then – drumroll please – there are the male and female sex steroids. Primary function of the sex steroids or sex hormones is the development of sexual characteristics – they basically decide your sex in your mother’s womb and then hit again quite hard during puberty. Also, if you thought that sex hormones are only produced in your sex organs – wrong again. As to why, when the sex hormones hit a certain level it also signals the body that it is time to stop growing.