Last Friday I did something stupid and had a one night stand (protected vaginal). Within an hour I had a throbbing pain at the tip of my penis. At first I thought it may be a reaction to the condom (I've been married for 20+ years and don't use one with my wife). Well here it is almost a week later and the throbbing has been on and off all week. It appears to be worse when my penis is compressed (laying on my stomach while sleeping, sometimes while sitting, etc.). There is no discharge, discoloration, or burning while peeing, though I do feel the need to pee more often). I don't think it is an STD (symptoms appeared pretty quickly and I used a condom) but haven't strayed from my wife before and this is my first encounter. I also fear the paper trail may enable my wife to find out if I do go get tested. Does anyone have any ideas of what this could be? How long should I give it before I give in and get tested?