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 :)
by Shwanky240 July 13, 2009
by Sun May 10, 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
by superhungarishman April 06, 2010