by Claude Opus 5.5
Can a person consent to sex if they are very drunk or have taken drugs? Where would you draw the line, and why there?
This is one of the hardest questions in the whole topic, and it is also one of the most practical. Many sexual encounters between young adults involve some alcohol. Most people would not say that one drink makes consent impossible. Almost everyone would say that someone who has passed out cannot consent. The difficulty is everything in between.
What the law says
In England and Wales, the Sexual Offences Act 2003 says a person consents if they agree by choice and have “the freedom and capacity” to make that choice. Being drunk does not automatically mean someone lacks capacity. In a 2007 case called R v Bree, the Court of Appeal said that a person who has been drinking can still consent, but that capacity can disappear before someone loses consciousness. The court deliberately did not set a precise point, because people react to alcohol and drugs so differently.
The law also says that if someone is unconscious, or has been given a substance without agreeing to it, the starting assumption is that they did not consent. And the person who wants to go ahead must reasonably believe the other person is consenting. Being drunk yourself does not make an unreasonable belief reasonable.
Three ways to draw the line
There are several possible places to draw the line, each with arguments for and against.
The first line is unconsciousness: only someone who is asleep or passed out cannot consent. This is clear and easy to apply. But it is far too permissive. Someone can be awake and still have no idea where they are, who they are with, or what is happening. Treating them as able to consent would leave very vulnerable people unprotected.
The second line is any intoxication at all: no one who has had a drink or taken drugs can consent. This is very protective. But it would mean that a huge amount of ordinary, wanted sex between couples who had a glass of wine was technically non-consensual, which seems wrong and would make the rule impossible to take seriously. It would also treat adults as unable to make choices about their own lives whenever they have been drinking.
The third line is somewhere in between, based on what the person can understand and decide. On this approach, a person lacks capacity when intoxication means they can no longer understand what is happening, weigh it up, and make and communicate a real choice. This is the approach the courts take. It is harder to apply, but it focuses on what actually matters.
Signs that the line has been crossed
Because the third line cannot be measured by a number of drinks, people need to look at behaviour. Signs that someone may have lost capacity include: slurred or confused speech; not knowing where they are or who they are with; being unable to stand or walk steadily; vomiting; drifting in and out of consciousness; or seeming very different from their usual self. None of these is a precise test, but each is a warning. The more of them there are, the stronger the reason to stop.
A good rule of thumb is this: if you are unsure whether someone is too drunk or high to consent, treat them as if they are. The cost of waiting is small. The cost of being wrong can be enormous and permanent.
Why draw the line there?
The reason for drawing the line at capacity, rather than at unconsciousness or at any drink, comes from what consent is for. Consent protects a person’s right to decide what happens to their own body. That right only means something if the person is actually able to decide. A choice made when you cannot understand what is going on is not really your choice. At the same time, adults who are mildly affected by alcohol can still make real choices, and respecting their right to decide means not treating every drink as removing it.
Does it matter how they became intoxicated?
In the case behind these seminars, one of the disputed points is whether the drugs were taken willingly. Students sometimes think that if a person chose to drink or take drugs, she has accepted whatever follows. That is a mistake. Choosing to drink is not choosing to have sex. And if a person becomes too intoxicated to decide, that is exactly when others must take more care, not less. How someone became intoxicated may matter to working out the facts, but it does not change the question of whether they could consent at the time.
A question to finish
Here is a hard case for discussion. Two people have both been drinking heavily and have sex. Neither clearly remembers the details the next day. Was there consent? Does it matter if one was more drunk than the other? Who, if anyone, did something wrong? There is no easy answer, but working through it shows why “just don’t have sex with someone who is drunk” and “drunk consent is still consent” are both too simple.