The private parts of a woman who has already had sexual intercourse with someone else

Got the covid-19 vaccine

Rolling back to the 1970's joy of sex book,a buttered bun is the highest bond between two male friends. To have sex with a woman, cum inside her, and have the other male have sex with her right after him and let his cum get all over his penis.

aka sloppy seconds. Though this one goes back a few hundred more years.