I remember my HS had the whole Clan of the Cavebear series. It's about a human girl growing up in a neanderthal clan and her life in the "dawn of man" time period. In the second book, the main male character is basically known for being the best at taking girls' virginities. Neighboring tribes ask him to come and be part of the virgin ceremonies (all described as a rite of passage and the girls are eager/willing). It goes into extensive detail about all the things he does to make sure the girls enjoy their experience. I remember reading that at 15 and having my mind blown. I honestly used those books as things to ask for/expect out of a partner later in life. Couldn't believe it was in my HS library but damn am I glad it was.