Anal Sex: What It Is, How to Prepare, and How to Stay Safe

What Is Anal Sex?

A Straightforward Definition

Anal sex, in its most common usage among MSM, refers to penetration of the anus by a penis. It can also encompass penetration with fingers or toys. The term covers both giving (insertive) and receiving (receptive) penetration, and it is one of the most frequently discussed activities in gay and bisexual male sexual culture — though far from the only one.

A brief note on anatomy helps explain why preparation matters. The anus has two rings of muscle known as sphincters. The external sphincter is under voluntary control — you can consciously relax it. The internal sphincter, sitting just behind it, operates involuntarily and relaxes in response to gentle, sustained pressure rather than force. This is why patience, communication, and adequate lubrication are not just “nice to have” but physiologically necessary for comfortable anal sex. Rushing or forcing past an unrelaxed internal sphincter is the primary cause of pain and tissue damage.

Tops, Bottoms, Versatiles — and Sides

Within MSM culture, a “top” is someone who prefers the insertive role, a “bottom” prefers the receptive role, and a “versatile” (or “vers”) person enjoys either. These are preferences, not fixed identities. Many men find their preference shifts depending on the partner, the mood, or the stage of life they are in. There is no hierarchy between these roles, and no role is inherently more “masculine” or “feminine” — that assumption is a cultural myth worth discarding.

It is equally important to recognise the “side” — a man who does not engage in or prioritise anal sex at all, preferring oral sex, mutual masturbation, frottage, or other non-penetrative activities. The growing visibility of this identity is a healthy corrective to the assumption that anal sex is the defining or default sexual act between men. It is not. If anal sex does not appeal to you, that is a completely valid position, and no explanation is owed to anyone.

Preparing Your Body

Douching — What Works and What’s Too Much

Douching means rinsing the rectum with lukewarm water before anal sex, typically using a bulb syringe. The rectum — the final twelve to fifteen centimetres of the bowel — is the holding area for faecal matter before evacuation, and between bowel movements it is usually relatively clear. For most people, a gentle rinse with a small amount of lukewarm water is sufficient. Fill the bulb, insert the nozzle a short distance, squeeze gently, expel, and repeat until the water runs clear. This rarely takes more than two or three rinses.

The critical point is knowing when to stop. Introducing too much water or using too much force can push past the rectum into the sigmoid colon — the S-shaped section of the bowel directly above it — which can trigger a full bowel movement. This achieves the opposite of the intended result and leaves you feeling less prepared, not more. Over-douching also strips the thin mucosal lining of the rectum, creating micro-tears that increase vulnerability to STI and HIV transmission. The BASHH 2016 guideline on sexual health care for MSM identifies rectal douching as a risk factor for exactly this reason. Less is more.

Douching is also entirely optional. A high-fibre diet, adequate hydration, and timing sexual activity a couple of hours after a bowel movement can mean douching is unnecessary. It is a tool for confidence, not a prerequisite for sex.

Lubrication — Why It’s Essential, Not Optional

Unlike the vagina, the rectum does not produce its own lubrication. Without an external lubricant, penetration creates friction against the thin rectal lining, leading to discomfort, pain, and a significantly higher chance of micro-tears — which in turn increase the risk of infection. Lubrication is not a luxury; it is a basic safety measure.

Water-based lubricant is compatible with all condom types and is the most widely recommended option. Silicone-based lubricant lasts longer and is useful for extended sessions, but it is not compatible with silicone toys. Oil-based products — including hand cream, moisturiser, coconut oil, and petroleum jelly — must never be used with latex condoms. Oil degrades latex, causing it to weaken and tear, which is why every NHS safer-sex resource specifies water-based or silicone-based options only.

Many saunas provide lubricant and condoms in communal areas, but carrying your own sachet is a reliable backup. If you find that the lube provided is not a type you are comfortable with, having a preferred alternative in your locker means you are never caught short.

Staying Safe — STIs, HIV, and the Prevention Toolkit

Why Anal Sex Carries Higher Risk

Anal sex carries the highest per-act risk of HIV and STI transmission of any common sexual activity. The reason is biological: the rectal lining is a single cell layer thick in places (much thinner than vaginal or oral tissue), and the tissue beneath it is rich in CD4 immune cells — the very cells that HIV targets. Micro-tears, even ones too small to feel, give pathogens a direct route into the bloodstream. The receptive partner faces a higher statistical risk than the insertive partner, but both partners are at risk.

This is not a reason to avoid anal sex. It is a reason to use the prevention tools available — and those tools have never been more effective.

Condoms

Condoms remain a cornerstone of STI prevention. For anal sex, use condoms rated for the purpose with a generous amount of water-based or silicone-based lubricant. Most condom failures during anal sex are caused by insufficient lubrication or incorrect application rather than a manufacturing defect. Applying the condom to a fully erect penis, pinching the tip to remove trapped air, and unrolling it all the way to the base are the three steps that make the biggest practical difference.

PrEP (Pre-Exposure Prophylaxis)

PrEP is a medication (typically tenofovir disoproxil/emtricitabine) taken to prevent HIV infection before exposure occurs. It is available free from NHS sexual health clinics across the UK.

There are two oral dosing schedules. Daily dosing involves taking one pill every day; protective levels in rectal tissue are reached after approximately seven days of consistent use. Event-based dosing (the 2-1-1 schedule) involves taking a double dose two to twenty-four hours before sex, then one pill twenty-four hours after the first dose, and one more pill twenty-four hours after that. Event-based dosing is validated for rectal tissue exposure only. It is not validated for cisgender women having vaginal sex or for transgender men engaging in receptive frontal/vaginal sex, because tenofovir concentrations build more slowly in vaginal and frontal tissue than in rectal tissue.

A significant recent development is the availability of injectable PrEP (cabotegravir), approved by NICE and now in active rollout across NHS sexual health services in England. Administered as an injection every two months, it is available to individuals for whom oral PrEP is not clinically appropriate or acceptable — including those who struggle with daily pill adherence, not only those with medical contraindications. Ask your sexual health clinic whether you are eligible.

PEP (Post-Exposure Prophylaxis)

If a condom breaks or you have unprotected anal sex and are concerned about HIV exposure, PEP is an emergency course of antiretroviral medication that can prevent infection if started within seventy-two hours — though sooner is significantly more effective. PEP is available from A&E departments and sexual health clinics. Do not wait; attend as soon as possible.

Testing and Vaccinations

The NHS recommends that MSM who have condomless sex with new or multiple partners test for STIs and HIV every three months. If condomless sex is not part of your practice, testing at least once a year is still advised, because some infections — chlamydia and gonorrhoea in the rectum, for example — can be entirely asymptomatic.

Several vaccinations are available free for MSM at sexual health clinics in England: Hepatitis A, Hepatitis B, and HPV. The HPV vaccine is available to MSM up to and including their 45th birthday; once a person turns 46, they are no longer eligible under the free NHS programme.

If you have questions or need to find your nearest clinic, the National Sexual Health Helpline is available on 0300 123 7123 (Monday to Friday 9am–8pm, weekends 11am–4pm), or you can contact THT Direct on 0808 802 1221 (Monday to Friday 10am–6pm).

Consent and Communication

Penetrative sex raises the physical stakes of any encounter. Anal penetration without adequate preparation, lubrication, or willing participation risks injury as well as emotional harm. This makes consent not merely important but essential — and it must be enthusiastic, ongoing, and revocable at any point.

In a gay sauna, much communication is non-verbal. This is not an obstacle to consent; it simply means the signals need to be unambiguous. Positioning yourself receptively, maintaining eye contact, guiding a partner’s hand, or nodding are all affirmative signals. Conversely, a turned shoulder, a step away, a hand placed flat against someone’s chest, or simply not responding are all forms of “no” — and they must be respected immediately and without question. If you are uncertain whether a partner is consenting, pause and check. A brief spoken “You okay?” costs nothing and communicates respect. For a broader look at how consent and boundaries work in sauna environments, see our health and safety guide.

Anal Sex in a Gay Sauna — Practical Context

Anal sex does happen in gay saunas, but it is far from the only activity taking place. Oral sex, mutual masturbation, and simply being present — watching, relaxing, socialising — are equally common. There is no expectation that a visit will involve penetrative sex, and no one is entitled to assume otherwise.

Where anal sex does occur, it is most common in private or lockable rooms and in dark rooms, where there is more space and relative privacy. It is less typical in communal wet areas such as steam rooms or sauna cabins, partly because of heat and partly because of hygiene considerations. If you plan to have anal sex during a visit, confirm that condoms and lubricant are available — most venues stock both — or bring your own. Use a towel on any shared surface, and make use of the shower facilities afterwards. Our facilities guide explains the typical layout of a UK gay sauna in detail.

Common Misconceptions

The belief that you must “pick a role and stick with it” is one of the most persistent myths in MSM culture. Roles are fluid, preferences evolve, and many men are happily versatile — or happily “sides” who do not engage in anal sex at all.

Another common misconception is that pain during anal sex simply means you need to “relax more.” Pain is a protective signal. The correct response is to stop or slow down, add more lubricant, and reassess. If pain persists despite adequate preparation and patience, it is worth speaking to a healthcare professional. Pushing through pain risks tissue damage and can create a negative association that makes future experiences harder.

Some people believe that being on PrEP removes the need for condoms. PrEP is close to 100% effective at preventing HIV when taken correctly, but it offers no protection against gonorrhoea, chlamydia, syphilis, hepatitis C, or other STIs. Condoms and PrEP work best as complementary tools, though the right combination depends on individual circumstances — a sexual health clinic can help you tailor a prevention strategy that works for your life.

Finally, the idea that regular receptive anal sex causes lasting damage to the sphincter muscles is not supported by evidence. When anal sex is practised with adequate preparation, lubrication, and at a pace that feels comfortable, it does not cause chronic harm. Persistent issues are extremely rare and are typically associated with trauma or very aggressive practices undertaken without preparation.

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This guide is part of the Gaysaunas.co.uk Core Guides series. For information on preparing for a visit, see our first-timer’s preparation guide. For guidance on consent and social etiquette, see our etiquette and consent guide.