A Car Game Called Sex

Anyone know a car game called sex? I just played this with one of my bestfriends, josh, and his best friend jamie as josh was driving to a point where he could drop me off so i could get home. Okay, this is how the game works:
you look out for cars with only one working headlight
once you see one, you or whoever saw it first hits the roof of the car and says sex
last one to hit the roof of the car must an article of clothing off
which would be shoes, socks, pants, shirts, bras, etc...

What happened with this round of the game you ask? All three of us ended up topless, jamie with only his boxers on, josh with only his pants and boxers, and me with only my pants and patnies. Hope that gives you a good mental pic ladies and gents ;3