sexless marriage

I've been with my husband for almost 2 years married for 2 months. and we don't have sex. it's like I have to force him to have sex with me. I walk around my house, when the kids aren't there or when they are sleeping, naked. is that maybe why? it's like he doesn't get excited anymore about seeing me naked. I'm a thick girl, 44 inches around my butt 32 inch waist and double d's, which he loves. but is it my fault that we don't have sex? did I make it too easy cause I'm always down for sex.. I'm just not sure what to do anymore. I've talked to him about it and he says it's not me he just doesn't like his body he's gained quiet a bit since we've been together.. any help would be great.. I'm not sure if I can stay in a sexless marriage..