My boyfriend has this problem as well.. But the thing is, he can masterbate in one day, like 2 times alone, then we'll be together and have sex for hours, and he cums like another 5 times, and then afterwards while im sleeping, its like he needs to do it again.. He also loves to look at porn and stuff like that.. Which I dont mind much.. I figure, if this is the way his body is, then fulfill your need, as you need to. Its not like he takes up all his energy and has none left for me... Thats for sure.. But im afraid as he gets older, its gonna like, fall off or something.. Also, I have a question.. From doing this so often, can one become sterile?, cause I notice the change in consistency of the cum after the first couple of ejaculations..And we've been trying to have a baby, with no success... But by all means, i'm not complaining at all about my sex life..But it does worry me a little bit.. I would hate to think of it as him being selfish.. But sounds right to me..