The big "O"

Is it wired that my husband can't make me "get there"? We've been together almost 4 years and I got there when he was on top 1 time I love him so much like literally the love of my life. But is this normal? We do argue now and then but who doesn't. I'm just concerned and lately it's like a chore and I "finish the job" after he leaves the room to go eat after we're done I just want this solved. I wish the big moment could happen while we were "busy"