guys cum

im 18, my bfriend is 22, and im not on the pill. he wears a condom when we have sex. he hates!!! wearing one and wants me to go on birth control. i do make him cum inside me when he is wearing a condom, he has no problem with that:) but he really wants to cum inside me without wearing one. i dont understand why he wants to cum inside me? will i feel it if he does cum in me? whats the difference for him cumming in me, wearing a condom, or not wearing one?