It's funny to read the "she might ask me to try it" responses. I can only think of the other thread a few days ago asking what the most disturbing thing you saw was online. I don't think any of us are about to start slitting throats based on what we watched.
I think the reason people watch porn is the same reason they play the lottery, everyone likes to dream!
I wouldn't really have any issues with it. I'd be happy that we're that honest in the relationship.