Group Sex and Sex Outside the Home: Consent and Safety
This kind of preference is not wrong, but the more people are involved, the clearer consent and protection need to be. This article sums up what to prepare before, during and after.


Key points
- Consent must be clear, ongoing and possible to withdraw at any time. People who are very drunk or unconscious cannot consent.
- Change condoms every time you change partners, use water- or silicone-based lubricant, and plan PrEP in advance.
- Test for HIV and STIs every 3 months if you have multiple partners, and if something goes wrong, start PEP within 72 hours.
I believe adults have the right to choose the shape of their own sex lives, as long as everyone consents and no one is harmed. So having sex with several people at once (group sex), or going to parties with sexual activity, is not something I will judge. Medically, though, as the number of people increases, several risks increase too. This article focuses on what helps you get home safe in body and mind.
Consent is the heart of it
Consent is not a one-off agreement at the start. It has to be there the whole time, and anyone can change their mind partway through.
- Talk first about what is okay and what is not, whether condoms will be used, and whether photos are allowed (the default answer should be "no").
- Set a stop signal: a word or gesture everyone knows, and stop immediately when someone uses it.
- Watch body language. If someone looks uncomfortable, goes unusually quiet or pulls away, stop and ask.
- Being very drunk or high means consent is not possible. Someone who is unconscious or cannot speak clearly cannot consent, medically or legally.
- Consent with one person is not consent with everyone.
If your activity includes elements of BDSM, read more about safety in the article on sexual masochism and BDSM.
Consent
- Talk first about what is and isn't OK
- Ongoing; can change your mind midway
- A stop signal, and stopping at once
- Photos only if everyone agrees
Not consent
- Someone very drunk, unconscious or incoherent
- Consent to one person ≠ consent to everyone
- Silence, discomfort or pulling away
- Going along under pressure or fear of being left
Preventing HIV and sexually transmitted infections
- Bring enough condoms and change them every time you change partners, including when switching from anal to vaginal or oral sex, and put condoms on shared sex toys.
- Lubricant: choose water- or silicone-based. Don't use oil, lotion or saliva, because they weaken condoms and make tears more likely.
- PrEP: if you take it daily, take it consistently long enough for protective drug levels to be reached before the event. Men who have sex with men may be able to use on-demand 2-1-1 dosing if a doctor assesses it as suitable.
- PEP: if you were not on PrEP and had a risk, start as soon as possible, within 72 hours, and take it for 28 days.
- Doxy-PEP: the 2024 CDC guideline recommends considering it for men who have sex with men and transgender women who have had syphilis, gonorrhoea or chlamydia in the past year, to reduce the chance of these bacterial infections. A doctor must assess you first.
- Vaccines: check whether you have had hepatitis A and B vaccines and the HPV vaccine. Where mpox is circulating, mpox vaccination may also be considered.
Preparing before you go
- Get enough sleep, eat and drink water.
- Tell a trusted friend where you are going and who with, and agree a time to message them that you are safe.
- Pack condoms, lubricant and any regular medicines.
- If you are going to douche, use a small amount of warm water, no soap or antiseptic, don't do it too often, and leave some time before sex, because heavy douching makes the lining fragile.
- Ask yourself, "Am I really ready?" If you are going because you are afraid of being left or feel pressured, you don't have to go.
During the event
- Don't rush, don't force anyone, and respect it when someone says no.
- Be careful with alcohol and drugs, especially GHB with alcohol, and poppers with erection medicines (read about chemsex).
- No body-shaming, and no discrimination based on anyone's gender or HIV status.
- If anyone loses consciousness or is breathing abnormally, call 1669 (Thailand's medical emergency number) immediately.
The law and privacy
- Public places: indecent acts in public are an offence under the Thai Criminal Code, and may force people who did not consent to see them. Keep it to private spaces that everyone knows about and agrees to.
- Photos and videos: everyone's consent is required. Sharing obscene or private images of others without their consent is against the law.
- Age: everyone must be an adult. Sexual activity with someone under the legal age is a serious crime, whether or not they "consented".
Afterwards: looking after yourself
- Shower, drink water and rest.
- If you had unprotected risk, think about PEP within 72 hours.
- If you regularly have multiple partners, test for HIV, syphilis, gonorrhoea and chlamydia every 3 months, testing every site that had contact, such as the throat and rectum (read: PCR STI testing).
- Watch for symptoms such as sores, bumps, discharge, burning when you pee, a rash or fever, and come in to be tested.
- Check in with yourself about how you feel. If you feel guilty, anxious or that a line was crossed, you can talk to a doctor about it. If you were assaulted, go to hospital as soon as possible.
- Before goingPrepare protection
Condoms, water/silicone lube, PrEP as planned, tell a trusted friend
- DuringChange condoms every time
With every partner or position change; watch substances and alcohol
- Within 72 hPEP if at risk
If not on PrEP, start as soon as possible and continue 28 days
- Every 3 monthsSTI tests at every site
HIV, syphilis, gonorrhea, chlamydia, including throat and rectum
How Dr. Kris can help
At Dr. Kris Clinic we help you plan prevention before you go, including PrEP, PEP and doxy-PEP where appropriate, vaccines, and STI testing when you get back. We can also talk about consent and how you feel afterwards, without judgment. Consultations are available at the clinic in Surat Thani and online anywhere in Thailand, including in English.
Want help with this? Three simple steps
Reading is a good start. When you are ready, check where you are, see how a consultation works, then book a time that suits you.
1Free 2-minute self-checkSexual-health self-check — see your result instantly and send it to the doctor if you like.Start the self-check →
2See the steps and feesIndividual from 990 THB · couple 1,590 THB · 30–60 minutes, at the clinic or online via MCS Telemedicine.How a consultation works →
3Book with the doctorPick a time online or message us on LINE. Come on your own or with your partner. Payment confirms the booking.Book online →Self-checks are a guide only and do not replace a doctor's assessment. Outcomes vary from person to person, depending on the severity of symptoms, the complexity of the problem and other factors.
HIV risk, or want to start PrEP?
Consult in clinic or online. After a recent exposure, PEP works best the sooner it starts — within 72 hours.
Every medicine and service requires a doctor's assessment first.
Frequently asked questions
If I'm on PrEP, can I skip condoms?
PrEP prevents HIV very well when taken correctly, but it does not prevent syphilis, gonorrhoea, chlamydia or herpes. Condoms still help reduce the risk of these other infections.
How often should I test for STIs if I regularly have group sex?
Every 3 months is recommended, testing every site that had contact, or sooner if you have any unusual symptoms.
If my HIV self-test before the event was negative, does that mean I'm safe?
Not yet. A negative result only reflects your status from several weeks ago because of the window period, and it says nothing about other infections. You still need condoms or PrEP.
What should I do if I feel a line was crossed during the event?
First get yourself to safety and contact someone you trust. If you were assaulted, go to hospital within 72 hours for preventive medication and care. You can also get help from 1300 (Thailand's social assistance hotline) or the police on 191.
อ่านบทความนี้เป็นภาษาไทย
Sex หมู่และเซ็กซ์นอกบ้าน: ความยินยอมและความปลอดภัยที่ต้องรู้ →
References
- Bachmann LH, et al. CDC Clinical Guidelines on the Use of Doxycycline Postexposure Prophylaxis for Bacterial STI Prevention, United States, 2024. MMWR Recomm Rep. 2024;73(2):1–8.
- Workowski KA, et al. Sexually Transmitted Infections Treatment Guidelines, 2021. MMWR Recomm Rep. 2021;70(4):1–187.
- World Health Organization. Consolidated guidelines on HIV, viral hepatitis and STI prevention, diagnosis, treatment and care for key populations. 2022.
- Thailand National Guidelines on HIV/AIDS Diagnosis, Treatment and Prevention (Department of Disease Control, Ministry of Public Health), latest edition (in Thai)
This article is for education and does not replace diagnosis or treatment by a doctor. If you have symptoms or concerns, please see a doctor.












