A variation on the classic jynx game. When you and a friend of opposite sex (or same sex if you prefer) say the same word or phrase at the same time, if the male says "penis jynx" before the female says "vagina jynx", she cannot speak until she licks/sucks/gets you off with her mouth (depending on how you want to play)

See also, "Vagina Jynx"

When you eat dirt for the first time and leave your family to build a shack in the woods