I wouldn't mind if my boyfriend briefly looked at another girl, but if he like stared at her and commented on how attractive she was, then that would make me quite upset and angry with him! I wouldn't do this back to him though, I'd be more likely to give him a good hard kick or knee in the balls! lol That would certainly take his mind off other girls! lol
Are you in this situation with your boyfriend?... What would you do?... Would you stare at other guys to try and make him jealous, or take the direct approach and do what I would?...
As long as you are only looking and not ogling / drooling. My wife and I both look at other people when we're together, but we aren't staring or anything. A lot of times we'll discuss the people we're looking at.
I can't count how many times my wife has mentioned something about another girl's boobs or butt and I'm like, "I'm not falling for that trap!"