A childhood belief about virginity

When I was a child in Catholic school we were discussing the meaning of the "Virgin Mary." My mother had told me that women only have sex in order to have children (good Catholic girl). Since my brother & I are adopted I assumed that meant my mother was a virgin and I proudly informed the nun that my mom was the same as the Virgin Mary. I think the nun called my mom because I got a "sex talk" later that week.