There can be many reasons for pain during intercourse in a girl's anus

 Natural structure: The anus is a place that is not naturally designed for intercourse. It does not have lubrication like the vagina, which can cause pain due to rubbing and friction.

Tightening of muscles: The muscles of the anus are usually tight. When penetration is done without preparation or adequate lubricant, tension and strain in the muscles can cause pain.

Injury or tear: If the anus is suddenly or forcefully penetrated, it can cause micro tears or cuts, which cause irritation and pain.

Mental stress: If the girl is not comfortable or nervous, the muscles of the body and especially the anus can become more tight, which increases the chances of pain.

Lack of cleanliness: If hygiene is not taken care of, there is a risk of infection, which can cause irritation or pain.

If ever such a relationship is made, then things to keep in mind:

There should be complete consent.

Use good lubricant.

Do it slowly and comfortably.

Pay attention to the body's reactions - if you feel pain, you should stop immediately.

If you or someone is experiencing this kind of pain repeatedly, you should definitely consult a doctor.

If you want information on any other topic, you can ask without hesitation.