Came here just to ask this question because it has been in my head for a long time now. It doesn't have anything to do with me. My boyfriend isn't looking at other women at all when he is with me. Maybe he will notice a nice outfit and tells me how he pictures me in something similar and stuff like that. But I have noticed other men when are in a relationship stare at other women bodies who aren't even wearing anything beautiful (in my opinion) and just blatantly stare for a long period of time until that girl just goes out of his sight. Why would they do that in front of their SO or even when they are with their bros? Or talk about other girls while in a relationship? To me it's alien and weird.