hey guys, i had sexual intercourse over a long period of time with a lady friend, over many hours. and next day/twoo days later, a couple of place on the base of my penis was sore, before developing cut like marks that stung to touch. it s now four days and they ve scabbed up a little. no pus, no colour just painful initally now not so much. is this just chaffing from long sexual intercourse or somekind of sti