ok so me and my boyfriend just has unprotected sex for the first time for both of us. he did not cum inside of me. but im worried. he said that he has a small red rash like dot on the head of his penis. he said he only gets it when he jacks off or when we had sex. i looked up some answers and it said it was a friction rash, but im still scared its something else. should i be scared? could this be an STD? can i get something? help.