Anal sex done properly shouldn't hurt. When it does hurt, the cause is almost always addressable — and addressing it makes future sessions comfortable.
What pain usually means
The common causes, in order of frequency:
1. Insufficient lubricant (60-70% of cases)
The anus produces no natural lubrication. Anal sex requires 5× the lubricant of vaginal sex. Most first-time pain is fundamentally a lubrication problem.
The fix: use a thick, glycerin-free water-based or silicone-based lubricant. Apply generously externally; allow 30 seconds; apply internally. Re-apply every 5-10 minutes for water-based, every 30-60 for silicone-based. See best lubricant for anal play.
2. Going too fast (20% of cases)
The anal sphincter has two muscles — the outer (voluntary) and inner (involuntary). Both relax with familiarity, lubricant, and time — not force. Fast insertion bypasses the natural relaxation and produces tension that registers as pain.
The fix: slow insertion. Pause whenever there's tightness; the sphincter relaxes within 30 seconds of stillness. Take 60-90 seconds for initial insertion; not 10.
3. Wrong angle (5-10% of cases)
The rectum is not a straight tube — it has a slight curve. Penetration at the wrong angle hits the rectal wall rather than following the natural curve.
The fix: adjust angle until movement is smooth. The receiver typically knows when the angle is right; ask.
4. Insufficient warm-up (5% of cases)
Anal sex after 10 minutes of other intimacy is significantly more comfortable than cold-start anal. The body needs to be in a relaxed parasympathetic state; tension closes the sphincter reflexively.
The fix: warm-up matters. Don't lead with anal; let the body get there.
5. Specific medical conditions (rare)
Some conditions make anal sex genuinely painful regardless of technique:
- Haemorrhoids.
- Anal fissures (small tears).
- Anorectal abscess or infection.
- IBS / IBD flares.
- Specific anatomical considerations.
If pain persists despite addressing the other causes, see a GP. NHS anal pain guidance covers the diagnostic process.
What "normal" first-time sensation feels like
First-time anal isn't painless — the body needs to adjust to a sensation it's not used to. Normal first-time sensation:
- Mild stretching at the sphincter — uncomfortable but not painful.
- Pressure rather than pain.
- Brief moments of discomfort as the body adjusts to position changes.
- The desire to slow down or pause — completely normal; honour it.
What's NOT normal:
- Sharp, stabbing pain. Always a stop-signal.
- Burning sensation. Usually means lubricant has dried out or material reactivity.
- Pain that persists after withdrawal. Suggests injury; brief soreness is OK; lasting pain isn't.
- Bleeding. Mild spotting can be normal in some first-time cases; persistent bleeding isn't.
The progression protocol
For first-time or returning to anal:
- Start with fingers (well-lubricated, short nails) for orientation.
- Progress to small plug (25mm starter) for the body to learn the sensation. See butt plug sizing.
- After weeks of comfortable plug use, attempt partner penetration with a smaller-than-average dildo or a partner who can pace themselves.
- Build up over months. There's no schedule; the body sets the pace.
If something feels wrong during sex
Stop. Don't push through. The pain signal is information; trying to push past it produces injury and the body learns to tense in anticipation. Future sessions get harder, not easier.
For the broader protocol, see anal training sensible starting point and anal training kits UK pacing & progression.