Most women are not affected by the local irritative effect of intercourse. Others have a chronic, recurring bladder infection as long as they are sexually active. These women sometimes require taking antibiotics all the time in order not to get recurrent infections. You seem to fall somewhere in the middle.
The best advice is to urinate just after your "increased sexual pleasures" are through. This will help cleanse the area and help prevent bacteria from climbing up from the urethra (pee-hole) to the bladder, which is what causes the bladder infection.
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