A rainbow kiss is slang for a sexual act where two partners perform oral sex in the 69 position while the woman is on her period, then kiss to mix semen and menstrual blood in the mouth. The “rainbow” is the swirl of colours that result.
The act is talked about online far more than it’s actually practised. Before you try it — or judge anyone who has — you should know exactly what it involves, the health risks, and the safety steps that matter.
What Is a Rainbow Kiss?
A rainbow kiss has three parts:
- The couple gets into the 69 position with the woman on her period.
- The man performs oral sex on the woman; the woman performs oral sex on the man.
- After he ejaculates in her mouth and her menstrual blood enters his mouth, they kiss — swirling the two fluids together.
The phrase first surfaced on Urban Dictionary and went viral on TikTok and Twitter as a “shock” trend. Most people who hear about it never try it. A small subset of couples do.
It is sometimes confused with snowballing — a different act where one partner ejaculates into the other’s mouth and they trade the semen back and forth via kissing. Snowballing has nothing to do with menstruation; rainbow kissing requires it.
Health Risks of a Rainbow Kiss
Both menstrual blood and semen can carry infections. Mixing them in the mouth means any pathogen present in either fluid has a direct route to the gums, throat, and digestive tract — areas that may already have small cuts you can’t see.
Infections that can spread this way:
- HIV — Present in blood and semen. Oral exposure is lower-risk than genital exposure but not zero, especially with bleeding gums or mouth sores.
- Hepatitis B and C — Bloodborne. Hepatitis is one of the leading causes of liver damage, and untreated chronic hepatitis can lead to cirrhosis and liver cancer.
- Herpes (HSV-1 and HSV-2) — Spread through skin and fluid contact; can cause oral sores after exposure.
- HPV — Linked to throat and mouth cancers (oropharyngeal cancer). The CDC reports HPV is now the leading cause of these cancers in the US.
- Syphilis, gonorrhea, and chlamydia — All can infect the throat through oral sex.
- Bacterial imbalances — Menstrual blood and semen carry bacteria that can disrupt the mouth’s microbiome and trigger sore throats, oral thrush, or bad breath.
The risk is not “you will catch HIV from one rainbow kiss.” The risk is that any single act that exposes broken skin or mucous membranes to infected fluid is a transmission opportunity, and most people don’t know their partner’s full STI status.
How to Reduce the Risk
If you and your partner decide to try it, lower the odds of infection:
- Both get tested first. Full STI panel — HIV, hepatitis B and C, syphilis, gonorrhea, chlamydia, HPV (women), herpes if symptomatic. Wait for results before acting.
- Skip it if either of you has cuts, cold sores, mouth ulcers, or bleeding gums. Even brushing too hard before sex creates entry points.
- Don’t combine it with other risk factors. Drugs, alcohol, and rough oral sex all raise the chance of small injuries.
- Consider barriers. A condom for him and a dental dam for her remove the bloodborne pathway entirely — though they also remove the “rainbow” the act is named for.
- Vaccinate. Hepatitis B and HPV vaccines are widely available and cut several risks listed above to near-zero.
- Stay monogamous or know your partners. Casual rainbow kissing with someone you don’t know well is a bad bet.
Why Do Some Couples Try It?
The reasons couples cite are usually one of three:
- Novelty. Long-term partners run out of new things to try; this is firmly in “things you’ve never done” territory.
- Removing menstrual taboo. Some couples treat it as a way to share period sex without anyone feeling shame.
- Trust signal. Mixing fluids that society treats as “gross” can read, in the moment, as a private demonstration of acceptance.
Orgasms also help relieve menstrual cramps for many women, which is one reason period sex (with or without a rainbow kiss) is more common than people admit.
How to Talk to Your Partner About It
Don’t surprise anyone with body fluids. That’s not a kink — that’s a consent violation.
Bring it up outside the bedroom, when neither of you is aroused. Say what you’ve heard, what you’re curious about, and why. Ask what they think. If they say no, that’s the answer; pushing turns curiosity into pressure.
If they’re unsure, suggest splitting it into pieces — period oral sex one night, swallowing on another — so neither of you has to do the full act on the first try. Anyone who isn’t comfortable with all three parts (period oral, ejaculation in the mouth, kiss-and-swap) shouldn’t be talked into it.
Common Questions About Rainbow Kissing
Is a rainbow kiss safe?
Not entirely. It’s safer if both partners are STI-tested, vaccinated against hepatitis B and HPV, and free of mouth injuries. It’s never as safe as oral sex with barriers.
Is it the same as snowballing?
No. Snowballing is the trading of semen between mouths via kissing — no menstruation, no blood. Rainbow kissing requires menstrual blood.
Can a rainbow kiss get you pregnant?
No. Pregnancy requires sperm reaching an egg in the reproductive tract. Semen in the mouth is digested.
Why is it called a rainbow kiss?
The mix of red menstrual blood and white semen creates a swirl of colours that someone, somewhere, decided to call a rainbow.
Do most couples actually do this?
No. It’s far more discussed than practised. Surveys of sexual practices don’t even track it as a distinct category.
If you’re going to try a rainbow kiss, treat it like any other sex act with elevated risk: get tested, talk to your partner, and stop if either of you wants to stop. There’s no shame in skipping it, and no glory in pushing past someone’s “no”.
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