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 female says "Vagina Jynx" before the male says "Penis Jynx", he cannot speak until he licks/sucks/gets you off with his mouth (depending on how you want to play)
See also, "Penis Jynx"
"Molly Ringwald!" "Molly Ringwald!" - male and female together
"VAGINA JYNX" -female
"PENI... damn it" -male
"slurp, slurp" - male
"Now I can talk again, phew!" -male