rainbow kiss

rainbow kiss is when a couple (heterosexual), have sex while the female is in her menstrual cycle and the man cums in in her mouth and he gets some blood from the woman's vagina and they kiss and mix the contents of their mouths. forming a beautiful rainbow kiss.

guy 1: ayo dawg, me and my bitch gonna try that shit, whats it called?.... a rainbow kiss, you know what that is?
guy 2: yes, thank god im gay
guy 1: WHAT

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