Sex and Substances

The use of alcohol, drugs, or other substances alongside sexual behaviour is common enough to warrant naming directly — and careful enough to require that it be named precisely. Conflating two very different patterns creates confusion that makes it harder to understand yourself clearly and harder to know what, if anything, needs attention.

Chemsex — the intentional use of specific substances such as methamphetamine (tina, crystal, ice), GHB/GBL (G, liquid G), or mephedrone (meow meow, M-CAT) to enhance or prolong sexual activity — is part of this picture. For some people it is occasional and chosen, a deliberate addition to their sexual experience that remains within their control. For others, it has crossed into compulsion — the substance and the sex locked together in a pattern that drives itself. Both exist. The two questions that determine which is which: can you have sex without being on a chemical — and when the pattern arrives, can you stop it?

The two patterns that follow sit at opposite ends of a meaningful distinction — and they require different questions, different conversations, and different kinds of attention.

Alcohol is the most socially normalised substance in this picture. You can watch someone drink before sex and think nothing of it. It is legal, culturally embedded in dating and intimacy, and rarely named as a pattern even when it has become one. This is precisely what makes it easy to miss.

What alcohol does in a sexual context is more specific than simply lowering inhibitions. It does not create behaviour — it removes the resistance to behaviour that was already a possibility. The filter through which a person normally assesses a situation — who this person is, whether this is safe, whether this aligns with their values — becomes unreliable or disappears entirely. With it goes the capacity to weigh consequences clearly: what this will cost, who will be affected, what cannot be undone. If the thought of crossing a line was already there, alcohol makes it easier to give in to it. It promotes what was already present to the surface and reduces the internal friction that would otherwise hold it in check. Alcohol does not just ease anxiety — it suspends the self-regulation that would otherwise make a different decision. This is the prefrontal cortex going offline in real time.

This needs to be stated clearly: being drunk is not an excuse for infidelity. That is a different conversation entirely. Alcohol may be the context — it is never the cause.

The question with alcohol is the same as with any other substance: is it a choice, or has it become a condition? Some people discover — often only when they try to change it — that they cannot initiate sex sober, cannot be sexually vulnerable without it, or cannot engage in particular behaviours unless they have had enough to drink. How much is now needed to reach the same threshold? This pattern can run for a lifetime without ever being named.

Chemsex — the intentional use of specific substances such as methamphetamine (tina, crystal, ice), GHB/GBL (G, liquid G), or mephedrone (meow meow, M-CAT) in sexual contexts — these are not substances that lower inhibitions in the casual sense. They are the requirement.

The brain comes to associate this altered state with sex itself. Sober sex stops feeling less intense and starts feeling impossible — flat, meaningless, out of reach. The substance and the sex become so closely conditioned together that separating them feels unthinkable. Two patterns are now operating in concert — compulsive sexual behaviour and substance use — each one feeding the other, each one making the other more entrenched. Research argues this combination constitutes a distinct clinical presentation warranting its own diagnostic recognition (Pettit et al., 2025).

The broader landscape. Cocaine has a documented direct link to CSBD — it activates the same dopamine pathways as methamphetamine and has been specifically associated with higher rates of compulsive sexual behaviour in the research (Stavro et al., 2013). Cannabis is the most widely used substance in sexual contexts and can lower inhibitions and heighten sensation, but its direct link to CSBD is not strongly established — it sits more reliably in the first pattern than the second. MDMA and poppers appear frequently in sexual settings but are not significantly associated with driving compulsion in the same way. The substance matters. So does the pattern it creates in you — and whether that pattern is still yours to change.

Some people describe chemsex as making them someone else entirely during the experience — uninhibited in ways that feel liberating in the moment and deeply shameful afterwards. They may go months without it. Then disappear for days. What happens during those days may involve things they would not have chosen sober — things done to them, things they did, encounters that leave them feeling degraded rather than relieved. The shame of chemsex is particular. It is not just the shame of having done it again. It is the shame of what was possible when the self stepped aside.

In my experience working with people in this pattern, three things come up often: a trauma history, a sexual orientation that hasn’t been fully embraced, or a conflict between an individual’s sexual fantasies and who they allow themselves to be. The substance bridges that gap — temporarily.

Sexual experience with substances involves many things worth considering — your enjoyment, your safety, your sexual health, your wellbeing, and the impact on the people in your life. None of those are trivial. All of them deserve honest attention. And within all of that, two questions cut to the heart of whether a pattern needs attention:

If you can take the combination or leave it — if it is an occasional, conscious choice that you could set aside without difficulty — then the answer is yes, and nothing here requires urgent attention. If the answer is more complicated than that, the following questions may help clarify where you are.

If something in the questions above produced recognition, the most useful thing you can do is resist the instinct to treat the combination as a single problem. CSBD and substance use each have their own roots, their own function, and their own logic. When they co-occur, it is almost never random — they have been paired because each one is doing something the person needs. Understanding what each one is doing, separately, is more useful than treating them as one undifferentiated pattern with one undifferentiated solution.

This is also not work that can be done through willpower or self-management alone. Two interlocking patterns — particularly when one involves neurochemically potent substances — require specialist support. Not because you are beyond help, but because the entanglement is genuinely complex, and complexity deserves a properly equipped response.