Re: diaphrams - a girlfriend of mine put hers out on a yard sale with a sign"used only once".

I would think that UTI's are a possibility, especially if you're hot & moist. The bacteria would have a good place to go. Also, the pounding might cause a non-specific uretheritis just due to trauma.

Drink water! Cranberry juice (unsweetened - not the popular cocktails) is good because there is an enzyme in cranberry juice that is beneficial for the bladder. Lay off of the coffee, tea, colas, etc and go for pure water.