5mins endurance record and going flacid inside
I have a bit of a problem at the moment. When I am having sex with my gf, I seem to only last roughly five mins when she is only just about to start enjoying it!! Somtimes I even go flacid inside and then flop out and can't get it back up again. I think I also have phimosis, my foreskin comes back beyond the bell of my penis and then stays there which I believe could be why i go flacid. I think the foreskin is cutting the blood to my penis and thus reducing my erection.
Is this a plausible self diagnosis?
Also what do people do to help them last longer? or what can I do to last longer?
Thanks for any help