Me (21M) and my girlfriend (19F) have been dating for about 7 months now. So recently everytime after we have sex, I have cuts on my penis. I don’t have the courage to tell her about it since we never really have a sex talk. This has been going on for about 3 weeks and I don’t know what to do or where the problem is. Any advice as yo what might be causing the cuts and what should I do??