A “rainbow kiss” is an explicit sexual act involving the mixing of menstrual blood and semen in partners’ mouths during or after mutual oral sex, followed by a kiss where those fluids are exchanged.

Because this is a graphic, adult practice involving bodily fluids, it carries potential health risks (for example, transmission of sexually transmitted infections if partners’ blood or other fluids are exchanged), so it is not something casually recommended, especially for younger people or anyone who is not fully informed and consenting. If you ran into this phrase on TikTok or other social platforms, it’s often used as a shock term or “look it up” dare rather than actual advice, so treating it as mature, NSFW content and just scrolling past is usually the safest move.

If you’re feeling pressured, confused, or uncomfortable about sexual terms or trends you see online, it can help to talk to a trusted adult, health professional, or reputable sex-education resource instead of relying on social media comments. Information gathered from public forums or data available on the internet and portrayed here.