32 oz of water too much to drink at once? i did after sex to prevent uti. then told this is unsafe?

Myths: Drinking 32 ounces of water is not in any way unsafe.

Unlikely: It's unlikely that 32 ounces of water is going to cause any significant issues in an otherwise young health man such as yourself. Also you should know as a man you are unlikely to have significant issues with sexually related UTI's, this is more of an issue with women. You should try to be good about condom use though as this will help prevent STDs.