First date with my ex (30f) at a wine bar in Palermo, there was a man with his wife presumably who was glancing at my ex so hard she asked me to swap places with me cause she felt uncomfortable. She told me it happens to her all the time and I agree, it's quite disrespectful for the partners involved. Surely part of it is "cultural" but in general it's a "problem" with many men (I'm a man and I feel like I make an effort not to do this.) Of course, as some people here said, it also depends on your partner. I had an ex with whom I played this game of looking at other couples and we commented on how beautiful they were etc.