im an 18 year old lad and about 2 months ago after sex i noticed that my penis began to hurt. i had a look and noticed that in the middle of the bit of skin which connects the head to the foreskin there is a raw bit which feels as though its been cut. im not sure if this is because my girlfriend used teeth during oral or because of something sex related, however it hurts when i pull back my foreskin and also hurts during oral and sex. its becoming very frustrating for both of us. i left it for a full week before having sex/masturbating again but it just continues to hurt. any ideas?