Why doesn't he moan?!

My boyfriend doesn't usually moan during sex! Idk why and in a way I makes me feel as if I'm not satisfying him right. Whenever I give him oral he goes crazyy! He's moaning, pulling at the bed, and curling his toes but when it comes to vaginal intercourse he barely ever moans and I can rarely tell if he's came or not until he just completely stops and lays there for a little and then I feel it dripping out. Does anyone else experience this?