Uncle BJ

A blowjob a man gets from his female patner when menstruation prevents the couple from having vaginal sex. Uncle BJ is often a man's only available option for sex from his wife or girlfriend when Aunt Flo comes to visit.

Wife: "You'd better forget about tonight, honey. Aunt Flo's coming for a visit."

Husband: "Well, I hope she brought Uncle BJ with her!"

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