Boyfriend's manga/anime/hentai fascination bothers me

Hello! I have a 'problem' that's been bothering me pretty much throughout our 1 year relationship. First I'd like to say that I love my boyfriend very much and that's why I want to stop panicking about this silly thing.

So my bf is 27 years old and he is crazy about anime and manga. Generally I don't think there's anything wrong with people liking that type of comics and cartoons, but somehow him liking it (a lot!) drives me crazy. Especially anime-porn, also known as hentai. His computer is full of images, videos and comics, both pornographic and non-pornographic.

It's the female characters that bother me, and the fact that my man is lusting for them. I have self-esteem issues, and I'm working on them, and deep down I know that he thinks I'm the sexiest lady on earth. At least, the sexiest real one... I think I'm beautiful and have a great body, but I can't drop the idea that he would rather look at those innocent looking, big-breasted little cartoon girls.

I don't want this to bother me, because it's stupid and everyone has the right to like this stuff, right?
He also watches regular porn which doesn't bother me. I watch it myself occasionally. Somehow this hentai-stuff is making me super anxious. How should I deal with this? It really, really bothers me.