Hello, I recently started to feel a little sting when I started to urinate so I went to the doctors and they found a small trace of blood (not visible to the naked eye). During this time I had sexual activity w/my girlfriend and my semen was on her stomach which seems to have caused redness and itching in that area. Is that related to my issue and what could it be? My symptoms are: slight sting when I Urinate, no discharge , small trace of blood in urine slight increase in urination , and apparently my semen caused a skin irritation to my girlfriend. Please advise. Thank you.