Rainbow kisses: definition, risks and alternatives explained

The rainbow kisses (or rainbow kisses in French) have been circulating massively on TikTok, Urban Dictionary and the magazine press since 2019. Curiosity is legitimate: what exactly does it mean, how is it practiced, and above all, what are the real health risks?

This article answers all these questions about rainbow kisses in a neutral and factual way, without glamorizing or stigmatizing. The objective is simple: to provide the information necessary to make an informed decision whether curiosity remains theoretical or whether it becomes a practice between consenting adults.

The essential things to remember about rainbow kisses- Rainbow kisses: sexual practice where two partners perform simultaneous cunnilingus and fellatio (position 69), the menstruating person until the partner ejaculates, then exchange saliva mixture in a final kiss.- The health risk is real and bidirectional: menstrual blood + sperm = double potential vector of STIs.- The 3 levers for risk reduction: serological status known to both partners, dental dam, and choice of safer alternatives if the couple has not been exclusive for at least 6 months.- No obligation: curiosity imposes nothing. An explicit discussion remains the prerequisite.

What is a rainbow kiss: simple definition and origin of the term

A rainbow kiss refers to an intimate exchange between two partners in which they simultaneously practice oral sex (cunnilingus and fellatio, in position 69) while one of the two people is menstruating. At the time of ejaculation, both partners keep the collected fluids in their mouths (menstrual blood on one side, semen on the other), then join in a final kiss where the two liquids mix. It is this visual mixture of blood + semen, evoking two distinct colors, which gave its name to the practice.

The term appeared on Urban Dictionary around 2007, then exploded into mainstream culture from 2019 under the effect of a viral TikTok wave. The practice has since been commented on by Cosmopolitan, Grazia, Madmoizelle and numerous health media.

In French, we sometimes speak of rainbow kisses or rainbow kiss, direct copies of the English expression. The term is not recognized in clinical sexology: it is more of a slang word than a medical category.

Three preconceived ideas to correct straight away:

• This is not a practice reserved for heterosexual couples: any configuration where a menstruating person teams up with an ejaculating partner can technically achieve it.
• This is not proof of absolute desire or an “ultimate test” of the couple: no serious relationship is measured by a specific sexual act.
• This is not trivial from a health point of view, even within an exclusive couple, because certain pathogens can go unnoticed for months.

How to perform a rainbow kiss: step by step

Here, in neutral terms, is how the practice goes when attempted. The purpose of this section is not an incentive guide, but a factual description that helps understand why the risks described below exist.

• Step 1 - Synchronization: partners agree in advance on a time window (typically the first two or three days of the menstrual cycle, when the flow is most present) and discuss the progress.
• Step 2 - Positioning: position 69 is the most common, because it allows simultaneous stimulation and retention of fluids in the mouth at the time of finishing.
• Step 3 - Simultaneous finishing: the goal is for the ejaculating partner's orgasm to occur while the other is still performing cunnilingus, so that both fluids are in the mouth at the same time.
• Step 4 - Finishing Kiss: The partners come together and exchange a deep kiss during which the two liquids mix, creating the visual effect that gave rise to the name.

The non-negotiable reminder: the practice requires explicit, informed and prior consent from both partners. A person discovering the exact nature of the act along the way is, by definition, outside the scope of informed consent.

Health risks: why this practice requires caution

This is the subject most often poorly covered in mainstream content. The reality is that mixing blood and semen in the mouth creates a more direct route of contamination than classic oral sex, because the oral mucosa can present micro-lesions (gums, inside of the cheeks) which form a gateway.

The risk primarily concerns sexually transmitted infections (STIs), which can all circulate via blood and semen to different degrees.

Three key clarifications:

• Transmission is bidirectional: the menstruating person can transmit via blood, the partner ejaculating via sperm. Neither role is "safe" by default.
• Recent screening is not enough: the serological window for certain STIs can be up to 3 months. A negative test dated last week therefore does not exclude more recent contamination.
• Oral micro-lesions (too vigorous brushing of teeth, ulcers, sensitive gums) significantly increase the risk of passage of pathogens.

The observation is simple: it is neither dramatic nor trivial. The practice deserves the same health rigor as unprotected sex.

Consent, hygiene and preparation: the conditions for informed practice

If the practice is considered between consenting adults, here are the minimum conditions to reduce the risks to a minimum:

• Explicitly discuss several days before: nature of the act, individual boundaries, possible stop words, post-act emotional expectations.
• Know the serological status of both partners for HIV, hepatitis B and C, herpes, chlamydia, gonococcus, syphilis. Recent screening (less than 3 months) with no new exposure is ideal.
• Check for the absence of active oral or genital lesions: mouth ulcers, outbreak of cold sores, gingivitis, wounds, recent dental care.
• Avoid any aggressive teeth brushing in the 2 hours preceding (invisible micro-cuts are gateways).
• Provide simple post-procedure hygiene: gentle rinsing with water, without alcohol or aggressive mouthwash which would irritate the mucous membranes.
• Have a verbal plan B: a clear signal to interrupt without embarrassment if one of the partners wants to stop during class.

These points may seem technical, but they are the concrete translation of a simple principle: trust between partners and informed consent are the only real safeguards.

Safer alternatives: variants that reduce risk

Not everyone who is curious about rainbow kissing will go so far as to practice it. For those who want to explore the symbolism of exchange and intimacy without the double risk of blood and seminal blood, several alternatives exist:

• Use a dental dam (thin latex square) during cunnilingus: the physical barrier blocks direct contact with menstrual blood and preserves the possibility of salivary exchange at the end.
• Shift the double oral outside the menstrual period: the mechanics of the simultaneous position 69 remain, but the blood factor is removed. This is by far the simplest and most protective modification.
• Explore other intimate practices that play on the exchange of fluids in a more controlled way. The guides dedicated to masturbation as a couple, to learning fingering as a couple or to pegging cover complementary areas without double risk factor.

The other, complementary approach is the use of intimate accessories which prolong the erection and the sensation during oral without modifying the mechanics of the couple. Cock rings allow for a longer and more controlled embrace, and can be a good starting point for those who want to explore more intense intimacy without taking the step of a high-risk practice. Our cockring collection brings together all the models available, and the silicone collection is generally the right entry point for gentle use. For gay couples curious about prolonged oral practices, the dedicated collection offers suitable models.

To remember: the quick checklist before getting started

If you are seriously considering the practice, here are the 5 non-negotiable checks before any attempt:

• Preliminary discussion: nature of the act, stop-word, post-act emotional plan, everything is laid out beforehand.
• Known serological status of both partners, ideally less than 3 months without new exposure.
• No active oral or genital lesions at the time of the procedure (herpes, mouth ulcers, gingivitis, recent wounds).
• Hepatitis B vaccination confirmed for both partners (3 standard doses).
• Accepted fallback plan: a verbal or non-verbal signal allows interruption at any time without justification.

If only one of these boxes remains incompletely checked, the wisest option is to postpone or choose a safer alternative described above.

FAQ - rainbow kisses: frequently asked questions

1. What is a rainbow kiss?“Rainbow kisses” is the literal French translation of rainbow kiss. The meaning is strictly identical: sexual practice where two partners exchange a final kiss mixing menstrual blood and semen after simultaneous double oral sex.

2. Rainbow kisses and STIs: what is the real risk?The risk is real and higher than classic oral sex. The pathogens most concerned are hepatitis B (very contagious), herpes viruses and, to a lesser extent, HIV and hepatitis C. The main precaution remains the known serological status of both partners and the absence of active oral lesions.

3. How do I offer a rainbow kiss to my partner?The rule is explicit discussion, never facing a fait accompli. Choose a moment outside of the sexual context, explain what exactly the term covers, listen to the reaction and accept the refusal without pressure. A “no” or “not now” should end the conversation on this topic.

4. Are there alternatives to rainbow kisses?Yes. The simplest is the dental dam during cunnilingus, which eliminates direct contact with menstrual blood while maintaining the mechanics of the act. Shifting outside the period is the other most effective option.

5. Are rainbow kisses legal in France?Any sexual practice between consenting adults is legal in France. The legal question does not arise as long as explicit consent is respected on both sides. The ethical and health question, on the other hand, remains unresolved.

6. Why does this practice appeal to some people?Several motivations coexist: feeling of accepted transgression, symbolism of total exchange between partners, intensity of an act that goes beyond the usual register, or simple curiosity born from content seen on social networks. None of these reasons is invalid in itself, provided that both partners share the reading and accept the health conditions.