Do you think it's disgusting when people like or date their stepbothers/stepsisters?

I don't find it disgusting at all. It's not your fault if you're related to the one you're attracted to and it's not your fault you're attracted to someone you're related to. The only reason I frown on two people together that are biologically related is to avoid birth defects and deformations and such. Other than that, I really don't care, and it's none of my business, really =)