Chemsex — the intentional use of certain drugs to initiate, sustain, or intensify sexual activity — sits at the intersection of substance use and sexual health. It is most often discussed in relation to gay, bisexual, and other men who have sex with men, though it is not exclusive to any one group. This article looks at what chemsex involves, the substances most commonly used, the genuine health risks, and how a person who has come to feel dependent on the pattern can find support.
If drug use and sex have become tightly linked in your life and you are finding it hard to step away, that is something that can be worked with. Holina Rehab, on Koh Phangan, Thailand, offers a holistic, non-judgemental programme of addiction treatment designed to help people return to healthier patterns of behaviour.
What Chemsex Actually Is
At its core, chemsex refers to the use of psychoactive substances specifically to enhance or prolong sex, often over extended sessions. The substances most commonly involved are crystal methamphetamine, GHB/GBL (gamma-hydroxybutyrate and its precursor gamma-butyrolactone), and mephedrone or related synthetic cathinones. These drugs lower inhibitions, heighten physical sensation, and delay fatigue.
Chemsex is rarely only about the drugs. For many people it is bound up with emotional and psychological factors — a search for connection or belonging, difficulty with intimacy, low self-esteem, or the weight of stigma and past trauma. Understanding those underlying drivers is central to understanding why the pattern can be so hard to change, and why treatment works best when it addresses the whole person rather than the substance alone.
The Drugs Commonly Involved
Each of the substances associated with chemsex carries its own profile of effects and dangers:
- Crystal methamphetamine: A powerful stimulant that increases energy and libido and can keep a session going for many hours. It carries a high potential for dependence and is linked to cardiovascular strain, sleep disruption, and, with sustained use, significant mental health effects including paranoia and psychosis.
- GHB/GBL (“G”): A depressant taken in very small liquid doses. Its defining danger is an extremely narrow margin between a dose that produces the desired effect and one that causes unconsciousness (“going under”) or, in severe cases, stops breathing. The Terrence Higgins Trust describes G as the single biggest cause of death among people who engage in chemsex, and stresses there is no reliably safe dose because strength and individual tolerance vary.[1]
- Mephedrone and synthetic cathinones: Stimulants that increase arousal and energy. Newer compounds in this class appear on the market frequently, which makes their strength and effects unpredictable.[2]
Combining these substances compounds their individual risks. The comedown that follows a session commonly brings anxiety, low mood, exhaustion, and, over time, a growing reliance on the drugs to feel able to have sex at all.
Chemsex, Sexual Health, and Community Context
For some people, chemsex becomes a way of coping with pressures such as discrimination, minority stress, or internalised shame, and a route to a sense of belonging within social and sexual networks. Dating and hook-up apps play a facilitating role, with terms like “party and play” or “PnP” signalling an interest in combining drugs with sex.
From a sexual health standpoint, longer sessions, multiple partners, reduced inhibition, and inconsistent condom use are associated with higher rates of sexually transmitted infections, including HIV, gonorrhoea, chlamydia, syphilis, and hepatitis C. Research across European populations has found that the longer a chemsex session lasts, the higher the risk of bloodborne and sexually transmitted infection.[2][3] This is why sexual health services emphasise practical, non-judgemental harm reduction — regular testing, PrEP for HIV prevention, and safer-use information — alongside support for anyone who wants to change or stop.[3]
The Real Risks to Be Aware Of
1. Physical Health Risks
Chemsex can lead to dehydration and exhaustion, and, more seriously, to GHB/GBL overdose, cardiac strain from stimulants, and seizures — risks that rise sharply when substances are mixed or re-dosed. Where drugs are injected (“slamming”), sharing equipment adds the risk of HIV and hepatitis transmission.[1][3]
2. Mental Health Impact
The emotional aftermath of a session often includes shame, guilt, anxiety, and low mood. Repeated cycles can deepen these into longer-term depression or anxiety, particularly where chemsex is already being used to manage difficult feelings.
3. Dependence
The substances involved have a high potential for dependence. GHB/GBL in particular can produce physical dependence in as little as a week of daily use, with a withdrawal that can be medically serious and needs professional supervision.[1] As reliance grows, stepping away from chemsex becomes harder even when it is clearly causing harm.
4. Impact on Sexual Decision-Making
Because these drugs lower inhibitions, they can lead to sex that a person would not otherwise have chosen, or to inconsistent condom use — increasing exposure to STIs and HIV. Recognising this is not about judgement; it is about giving people accurate information so they can protect their health.
Getting Support
If chemsex has become a fixed part of your life and you are struggling to break the pattern, support is available, and reaching out is not something to feel ashamed of. Because chemsex so often connects substance use with underlying emotional and psychological factors, a dual treatment approach — addressing addiction and mental health together — tends to be the most effective.
Holina Rehab, in the calm setting of Koh Phangan, offers a safe and supportive environment for people seeking recovery from chemsex and related drug addiction. The team understands the specific challenges involved — including the physical risks of withdrawal from substances such as crystal methamphetamine and GHB — and combines medically supported detox, therapy, and wellness practices in a non-judgemental programme tailored to each person.
Whether you are only beginning to acknowledge the difficulty or have tried to stop before without success, meaningful change is possible with the right support. To talk it through with our team, we welcome your enquiry, or call us on +66 82 113 0657.
“Luxurious surroundings, the very best A+ care, and a varied and interesting programme. Cannot recommend highly enough. Changed my life for the better in every way imaginable.”
— Nish, Recovery.com Review, 17 Apr 2025 · ★★★★★
“People rarely arrive because of the sex or the drugs in isolation — they arrive because a way of coping has stopped being containable. Our work is to meet that without judgement, keep the person physically safe through withdrawal, and understand what the pattern has been doing for them. That is where lasting change begins.” — Dr. Aviva Wolf, Consultant Psychiatrist (draft quote — pending sign-off)
Sources:
1. Terrence Higgins Trust, “GHB and GBL: Understanding effects, risks, and harm reduction,” THT ChemSex.
2. “Chemsex use is changing in Europe,” aidsmap (Terrence Higgins Trust), 4 November 2025.
3. “South African harm reduction guideline for chemsex,” South African Journal of HIV Medicine, 2025.
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