How do I tell him to cum inside of me?

My boyfriend and I have been together for a year and a half, he has never cum in me before, he pulls out every time. I mean he is so scared of us being pregnant that he won't, he isn't scared of having kids, he scared of me getting hurt having a baby (he is a worry wart) anyway, I want to feel him cum in me. 
(I'm also in birth control, I've never missed a pill in the two years I've been on it)