Can't have a long lasting erection
since for months, me and my girlfriend started having sex and in some days that we planned on doing it, my erection always failed me and i don't know why. and the most embarrassing part was when we started to do it one day and my erection failed me when i was inside her but the worst part is that i love her so much and i don't want her to think the opposite.
So i ask, is there a cure or an explanation for this??