When a group of girls wear different colored lipstick and suck a guys dick, leaving different colored rings on the dick. Creating a rainbow effect :)
Me and 4 chicks had rainbow sex last night! RED YELLOW GREEN AND BLUE!
by Shwanky240 July 14, 2009
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When people from different races have sex, calling it rainbow sex, because of all the different skin colours there are.
A dark person, a fair person, a caucasion person and a mixed person have an orgy, it is called rainbow sex
by superhungarishman April 6, 2010
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When a girl mixes her period blood with a boy's cum and they both drink it
-Yo, me and this chick had rainbow sex last night!
-Bro, gross
by Bleeky November 6, 2019
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having sex with a girl on her rag
Hey I'm up for some rainbow sex. I don't mind.
by Sun May 11, 2006
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A type of sex that happens between two virgins, people often see rainbows when having this sex because it is awsome.
Anne: how did you lose your virginity?
Ella: i lost it while having rainbow unicorn virgin sex
Anne: Wow! I lost mine while having awkward virgin sex.
by Rainbow:unicorn:sparkle:times December 13, 2016
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