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!
av Shwanky240 13 juli 2009
having sex with a girl on her rag
Hey I'm up for some rainbow sex. I don't mind.
av Sun 10 maj 2006
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
av superhungarishman 6 april 2010

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