give blowjobs to the guys, the marks left on the guy's penis are the colors of a rainbow. Contrary to popular belief, this was not a term made up by Oprah, it was brought about in a juvenille fiction book called "Rainbow Party."
guy 1: dude what's all over your hands?
guy 2: oh I just left a rainbow party
guy 1: man you rock
Parent: whats a rainbow party?
Oprah: something i made up to get your children in trouble for absolutly no reason..
Parent: That sounds pretty mean but since your like a god and all i have to listen to you.
Oprah: i want to eat your babies.
At the second party, I was more relaxed, and before the end of the night had let each girl leave her mark.