To rephrase what happens with my girlfriend...
We tend to rub up against eachother through our clothing - which might be similar as to how you'd say.. thrust against our bedclothes for pleasure. A couple months earlier when this happened, my penis became erect inside of my pants and the foreskin did NOT retract. The more this happened, the more my foreskin retracted until it got stuck under the glans (paraphimosis i believe). I'm guessing since I'm rubbing my body against her, the contact is pushing the foreskin back behind the glans. And because of my sensitivity, it hurts. And now i have 2 questions..
1) Would stretching expand the phimotic ring so it will not become stuck behind the glans?
2) Is there any possible way to ensure that the foreskin stays covering the glans as i rub against her (i.e. same as rubbing against bedclothes)?