I cannot sustain an erection with my girlfriend. I can get one fine, using lube or jerking off or whatever, but the moment I'm inside her or she starts giving me head it's over and soft. We have been in a long distance relationship for a few months, visiting each other every couple of weeks and it's incredibly frustrating not being able to perform when we finally do get together.
I've tried a lot of things - stopped masturbating for a month, regularly masturbated, started doing kegels, masturbated to porn before encounters, masturbated to thoughts of her before encounters. Nothing has worked yet. This has been a recurring issue with all my previous girlfriends as well except for the first one where I had a few nights of performance anxiety and then got over it somehow.
When I am alone, watching porn or otherwise, I have no problem at all getting strong, lasting erections. She just left two days ago (and I won't see her again for two and half months) and the day after I masturbated 4 or 5 times with strong, sustaining erections, but couldn't even get close as hard with her the night before.
I've basically learned to just be disappointed by sex, but it's stressing her out because she thinks it's a failing on her end. Help!