Is it normal?? i dont understand.

So, im married. I love my husband and I would never do anything to hurt him. But he has a Habit that I don't like. He looks at pics of girls a lot. It'll be like "hot girls" or "hot ____ girls" with some kind of specification/category. It makes me feel unappreciated and I want to be like those girls. Like he tells me I have a nice ass, but when I see the pics he looks at, I feel like I wish I had a really smooth, tan, ass like they do. When he looks at these pics, it makes me not want to have sex and such. I feel insanely stupid because it's just pics and most of them are probably airbrushed and Photoshopped...fake shit. But it bothers me and makes me feel less than the pics and like he wants them more than me. He always just says, "well guys are visually stimulated..." i will reply saying, "i have boobs...they're ddd's...are they not good enough!?!?" And he says they're great and I'm sexy but it's hard to believe that when I think he looks at other pics of women. And we have sex ALL the time and I'll surprise him and occasionally send him a sexy pic of myself so don't feel like I can attract him sexually anymore. I can't get over the fact he does this no matter what. It turns me off. And I tell jut how I feel in a nice way so it's not he doesnt know! Is it normal for me to feel like this??