I just had an encounter. I performed anal sex with a condom that didn't break. I also recieved oral sex. I got home, washed up and noticed a red dark mark on the base of my penis (the area closest to my body). To me, it looks like it's just a mark similar to a hickey, probably caused by the oral sex or the tightness of the condom. But I don't know. It still scares me. I asked my partner if he was clean and he said yeah and he seemed honest about it. But this mark scares me.