TMI::: Need some info

Alright Ladies,

So I've been with my hubby for almost 3 years now. But for some reason he has an issue with (how do i put it?) Reaching his climax.. We tried everything to try and nothing works. I know some may say "take advantage of it" or "why complain?", but when I say he can't do it. He really cant unless he masterbates!!! I've looked this issue up and we tried different tricks and all that. I an desperate for advice because I honestly feel like I'm not doing my job to please him and he becomes exhausted after hours and hours of trying. I need help!!!!!!!