In my experience women are less visual than fantasy.... HOWEVER....
I would encourage it. If you try to surpress that stuff and hide it, THEN it will become a problem. You should be open and do things like that together. Hell, I'd let my wife look at the stuff while we were gettin' freaky. I'd find them for her. As long as I have control and I know she doesn't lie and cheat, no harm done.
Bottom line is that it isn't different. But since men are generally more physical and women are GENERALLY more emotional when it comes to sex, it stands to reason that it is less common.