Not attracted to my husband

I don’t know how to tell my husband I’m no longer physically attracted to him. He looks okay with his clothes on but when he takes them off it’s another story.

He’s attracted to plus size women and I’m attracted to physically fit men. I’m physically fit and he’s a big guy but not overweight. Somehow we went the opposite of our norm and ended up with each other. Still I’m NOT attracted to him. We both check our type out when in public. I feel like it’s all a mess. Now we’re married and have kids. I don’t know what to do.