One-night stand safety: the practical guide

Casual sex — a one-night stand, a hookup, sex with someone you're not in a relationship with — is a normal and completely valid choice. This guide isn't here to talk you into or out of it. It's here to cover the practical habits that make it safe, because the difference between a good casual encounter and a regrettable one is usually a few simple precautions taken in advance, not the decision to have casual sex at all.

Protection, every time

With a new partner whose status you don't know, protection is non-negotiable — not because casual sex is inherently dangerous, but because you genuinely can't assess STI risk any other way. You can't tell from someone's appearance, their job, how nice they are, or how clean their flat is. Most STIs have no visible symptoms, and many people who have one don't know it. Condoms are the only method that reduces STI transmission, so they're the baseline for casual sex regardless of what other contraception is in play.

Carry your own (see the party prep guide) so you're never in the position of deciding whether to risk it because nobody has one. If a partner resists using protection or tries to talk you out of it, that's a meaningful red flag — a decent person understands why it matters with someone they just met. "No condom, no sex" is a completely reasonable and healthy line to hold.

Consent with someone you don't know

Consent matters just as much in casual sex as anywhere — arguably more, because you don't have the established trust and communication of a relationship to fall back on. A few things worth keeping in mind:

Check in more, not less, with someone new. You don't know their signals yet, so explicit communication ("is this good?" "do you want to?") matters more. Enthusiastic participation is what you're looking for — not just the absence of a no.

Intoxication complicates consent, and casual encounters often involve alcohol. Someone very drunk can't meaningfully consent, and neither can you. If either of you is significantly impaired, the safe and responsible move is to wait. The party prep guide covers this in more detail.

And your own no remains available at every point, with anyone, including someone you went home with specifically intending to have sex. Changing your mind is allowed. The how-to-say-no guide covers this.

Personal safety

Going somewhere private with someone you don't know well warrants a few basic precautions — not out of paranoia, but because it's sensible with an unknown person:

• Tell someone where you are. A quick message to a friend with the address and who you're with. Share your live location with a trusted friend — it's easy on most phones and easy to turn off later.
• Keep your phone charged and on you. Your link to help and your way home. Don't let it die.
• Keep your own way home. Enough money or a working ride app, so you're never dependent on the other person to leave. Being able to leave whenever you want is a form of safety.
• Meet in public first if you can, especially someone from an app. A drink somewhere public before going anywhere private gives you a chance to read the situation.
• Trust your instincts. If something feels off, leave. You never owe anyone an explanation or an apology for leaving a situation that doesn't feel right.

These apply to everyone, though the specifics of risk vary. The general principle — keep your independence, keep a line to help, keep the ability to leave — is universal.

The follow-up

Knowing the after in advance means you're not scrambling if you need it:

Emergency contraception is time-sensitive — more effective the sooner it's taken — so if a condom failed or wasn't used and pregnancy is a possibility, it's not something to delay. The emergency contraception guide has the details.

STI testing has window periods — testing immediately after an encounter is often too early to detect a new infection, so testing is usually done a few weeks later (the when-to-get-tested guide covers the timelines). Building a regular testing habit is sensible if you have casual sex with any frequency.

PEP (post-exposure prophylaxis) can prevent HIV if started within 72 hours of a possible exposure — worth knowing about in advance if there's any HIV risk. The PrEP & PEP guide covers this.

The emotional side

Casual sex affects people differently. Some find it straightforwardly fun; some find the aftermath more complicated than expected (the emotional aftermath guide covers post-sex feelings, including with someone you won't see again). Neither reaction is wrong. It's worth being honest with yourself about how casual sex tends to make you feel, and choosing accordingly — not based on what you think you should feel, but on your actual experience. Safe casual sex includes being kind to yourself about the emotional side, not just the physical.