|If you are in good physical health, the problem you have maintaining an erection is likely mental. I have found that relaxing and becoming comfortable with my partner helps me maintain an erection. That may mean taking your time so you feel really comfortable with her. Maybe even laying naked together with no anticipation of having sex.
I have never had my foreskin bleed. You can always use a lubricant. My wife and I keep some handy in my night stand drawer.