Unclesex
When your uncle rapes you and you are under 18. Usually little boys. Also commonly done in basement.
Pepe: Hey guess what Eduardo
Eduardo: What?
Pepe: I lost my virginity
Eduardo: No way to who
Pepe: Uncle Juan-Carlos Luis
Eduardo: Well if unclesex counts then I lost my virginity to Uncle Jose
Eduardo: What?
Pepe: I lost my virginity
Eduardo: No way to who
Pepe: Uncle Juan-Carlos Luis
Eduardo: Well if unclesex counts then I lost my virginity to Uncle Jose