4 days ago I had a one time encounter with a very sexually active person. I had protected anal sex (I was the one inserting) for about 3-4 minutes. On top of the condom I had sex with my boxers on and poked it out of the boxer brief hole to make sure there was no skin to skin contact. I was just wondering if I should be worried or not. I tried my best to be as safe as possible. I checked the area before and there were no sores visible. As of 4 days later I have no signs of anything.