Make sure the water is moderately warm, not hot, and relax your butt. By Naveen Kumar. Cleaning can be overdone, however. A good lube makes a big difference. Drugs come with a plethora of risks all on their own.
No matter what you choose to do, you cannot completely control your body.
If you think something may be wrong with your anus, see a gay-affirmative doctor. If things are painful, relax, use more lube and take it slow. Oil-based lubricants such as lotion and moisturiser can weaken condoms and make them more likely to break.
The opening and closing of this muscle on its own can be very erotic.