Expert Q & A Answers About outercourse

Every time I get an erection, I start bleeding from my penis. Do I have an STD?

My girlfriend and I were dry humping with our clothes on. She was on top of me and rubbed herself on me. Five or ten minutes later, I noticed I was bleeding from my penis. I was really embarrassed...and now every time I get an erection, I start bleeding from my penis. Do I have an STD?