(slang, sexology) A supposed sex act in which a man and a woman who is menstruating simultaneously perform oral sex on each other, followed by a kiss where the couple mix semen and period blood in their mouths (which makes the so-called "rainbow").
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Things got really funny when Tamika mentioned if we knew anything about the rainbow kiss. […] "It's when your man eats you out while you're on your period." […] "You heard me, Monica. Your girl over here talking about rainbow kisses, Queens niggahs don't be doing that shit, that's them Uptown fools coming up with some shit like that."
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2003, Erick S. Gray, Booty Call, Brooklyn, N.Y.: Black Print Publishing, →ISBN, pages 125–126:
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However, when a health educator asked the youth with whom she works about rainbow kisses, the teens laughed at the idea, and said "no way" was it happening in their group (Barrett, 2004).
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2007, Susan L. McCammon, Choices in Sexuality, third edition, Victoria, Australia […]: Thomson, →ISBN, page 362:
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Kissed exchanges of period blood (the "rainbow kiss") and sperm (the "snowball") are probably acquired tastes.
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2010, James McConnachie, Sex, London, New York, N.Y.: Rough Guides, →ISBN, page 90, column 2:
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And while a rainbow kiss is certainly not the most common sex act around, Hall says it's just one activity on a spectrum of sexual activities that people with various bodily fluid kinks and fetishes can enjoy.
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2022 May 17, Amy Mackelden, Taylor Andrews, Emma Glassman-Hughes, “What's a Rainbow Kiss? Experts Explain How to Do It Safely”, in Cosmopolitan[1], New York, N.Y.: Hearst Communications, →ISSN, →OCLC, archived from the original on 2023-08-11: