boyfriend has low libido

Ive recently turned 18 and went on birth control to have sex with my boyfriend of three years. But ever since that magical first time, sex seems to just be on the back of his mind.

We’re long distance, so of course we don’t get that physical intimacy most couples get. So when he comes in town you know i want to get it on. But he doesn’t!

He came in town for the Labor day 96, and we had sex ONCE and he said he was fine with it.. I wont see him until November!!

Is this normal for men to not want to have often sex with their girlfriends???