I'm one of those guys that struggles to orgasm. Even masturbating I will sometimes last a really long time. It's more a mood thing than a sensation thing for me. I have to have my mind in the right state to orgasm. The good thing about it is I can have sex for as long as my partner wants often.

It's odd, because usually men are the ones who leave their partners wanting. For me my partners pretty much always get more than they bargained for, but I'm frequently left without orgasming. It's fine though. It's still plenty enjoyable without it.