Honestly, I think it's wrong. You should only think about your husband or wife and no one else, if you do, it's adultery. My husband said that he wouldn't mind having another gilr in the mix and I was apalled! I know that I'm not that pretty and definitely not that skinny or good at sex or anything, but that was extremely low for me. I know that he didn't mean it that way maybe, but it made me know that he wants someone else in his bed too. Thinking about anyone else but your spouse, to me, is a sin.