What is a rainbow kiss tiktok meaning?

A "rainbow kiss" TikTok trend is a controversial and explicit challenge where two people engage in oral sex during their menstrual cycle, then kiss each other to combine their blood and semen, creating a "rainbow" effect. This trend has been criticized for promoting unhealthy and risky behaviors, as well as being potentially harmful to participants' health. It is important to note that engaging in such activities can put individuals at risk for sexually transmitted infections and other health issues.