 [ Symptoms ] what should i do if i suspect an overdose of dilantin [ Disease ] no not if you urinated between the time you masturbated and when you had sex sperm will die as soon as it dries but you want to make sure your pre cum is not carrying any live sperm if you urinate though usually that flushes the urethra still you are playing with fire and asking for trouble at the very least invest in some condoms