I am a 26 yrold man in good health. I have been with my girlfriend for a year and we have great sex but I can't seem to climax. I don't have a problem getting an erection but I can't ejaculate and I eventually get tired and lose that too.
I can come when I masturbate but not with any other kind of stimulation.
As well as this being very frustrating for me, my girlfriend says she is frustrated and thinks it reflects on her performance (which it doesn't).
I don't know if there is something basic I can do to help e.g. diet change etc or if there is an underlying problem that I should be concerned about.