Is it normal to be disgusted by adultery in fiction?

I really cannot enjoy any sexual stuff if it involves adultery. I find it disgusting and not hot at all. Just recently I was looking at some artwork that depicted sexual activity. I actually found it very arousing, right up until I found out that it was depicting some married woman having an affair, and then my boner was killed.

Is that normal?

P.S. Yes I know it's just fiction but I still find it nasty. It's akin to someone writing fiction about genital mutilation for me.