I think there is a big difference between jealous and protective. Sometimes the two get confused. For example, if my husband sees me conversing with a man he knows is not a threat to me or our family, he's cool. If some idiot is bugging me in the mall, the idiot will find himself having his stupid head handed to him. lol
For me, I've never seen my husband show any interest in other women so I don't know how I'd react. I've seen a lot of women come onto him though, it's funny because he acts like they have the plague or something. Most common comment is "Look, I don't mean to hurt your feelings or anything, but I'm married!" At that point they notice the chubby little lady standing a few feet away and the light goes on. We're pretty mismatched, and unless we are holding hands most people would not put us together. I suspect though that if that was ever not his response, my eyes would turn a violent green and the other woman would have to run for her life!
(of the "green eyed dragon woman from *ell if you touch my man, and Valis would not like me" class)