Roman military policies about rape.
Hell, actual military behavior regarding rape throughout history.
The ancient Greek tradition that tutors would have sexual relationships with their same sex prepubescent students.
Pre-islam, Arabs practiced a tradition where if a father dies, the eldest son had to marry his mother, and have regular sex with her. Mohammed ended this practice.
Cult prostitutes
Destitute families selling their children (usually girls) into forced prostitution. Sadly this continues to this day in many places.
The oh kee pah ceremony. Look it up.
Eastern European trans marriage between women (one of whom undergoes a social sex change).
The pharoahs of Egypt practiced brother-sister incest for religious and political reasons.
Pitcairn's island. Look it up.
In some cultures, while officially banned, it is a widespread practice to sexually abuse unmarried daughters and sisters, so long as there is no breach of the hymen. So they get oral, "thighing", and anal. Some cultures do this to young boys too.
Virgin blood is used in Asian medicine. So virgins get kidnapped and forced into blood slavery where they get dunked into tanks full of leeches.
Honor killings. Again look it up. It happens in the West, too. In Europe it's widespread in immigrant communities and winked at by authorities.
Related: rape of a woman is considered a crimes against her family, not her. She's guilty of "being a slut". So in some communities, the punishment is that the courts order someone in the family of the victim to rape a girl in the attacker's family. She's then a slut, too, because.... umm...
The Catholics forcibly castrated some choir boys up until the 20th century.
Medieval knights would chose a highborn woman (wife of even a noble) and fuck her if they won the joust. The church invented courtly love to stop the practice.
Human beings are capable of some sick shit.
