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1.
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!
de Shwanky240 13 juillet 2009
 
2.
having sex with a girl on her rag
Hey I'm up for some rainbow sex. I don't mind.
de Sun 10 mai 2006
 
3.
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
de superhungarishman 6 avril 2010