performing oral on your female partner while she is having "that time of the month", then proceeding to make out with her.

When a guy gives a girl head while she’s on her period

A rainbow kiss is what you call when someone performs oral sex on a girl going through menstruation, then proceeds to kiss her.

A rainbow kiss is a sexual activity where a female who is on her period sucks a mans penis and keeps his cum in her mouth. The man continues to go down on her and keep the blood and cum in his mouth, then they kiss while mixing the fluid in eachothers mouths.

A man goes down on a girl during her period, Blood goes into the guys mouth.

The girl then goes down on the guy, the guy cums in her mouth.

They kiss and exchange blood and cum while doing so.

When a boy/girl gives a girl a head getting all the blood in there mouth and then the girl gives the boy/girl a blowjob and gets cum in her mouth then they kiss and mix the contements

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.