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!
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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
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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
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having sex with a girl on her rag
Hey I'm up for some rainbow sex. I don't mind.
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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.
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Exactly what it sounds like - Multiple men at war coming to terms with their sexuality, and deciding to have an orgy due to it..
Russia and Ukraine have been going at it for some time.. There's probably been at least five rainbow sex sieges by now!