how do I tell my husband..?

So here's the deal, me and my husband have sex about 1-2 times a week. Ever since I got pregnant with my daughter (who is now 4 months old) I haven't had a sex drive. He has a pretty high one, so it gets difficult sometimes and we argue. 
Anyway, he is obsessed with the thought of having anal. When I was pregnant we tried it for the first time. And I've done it 2 times since. But i don't like it. I can't relax enough and it just hurts. 
So Everytime we are going to have sex..he always asks for anal which almost turns into begging. And finally he acts like he's "settling" for sex if he can't get anal. 
I'm so annoyed because I DONT want to have anal and I'm sick of being asked for it. And when I say no..feeling like he's disappointed in just having sex.