What is a rainbow kiss?

A rainbow kiss is a purported sexual act involving both analingus and menstruation. It allegedly involves a man performing oral sex on a woman while she is menstruating and then immediately performing analingus, supposedly resulting in the mixing of menstrual blood and fecal matter on his face, creating a visual effect resembling a rainbow.

The existence of the rainbow kiss is highly debated and widely considered to be an urban legend. There is no reliable documentation or credible evidence to support its actual occurrence. Many sources attribute it to being a purely fictional creation circulated online. The act is also considered by some to be inherently unsanitary and potentially dangerous due to the risk of infection.