I heard a funny story that happened in Israel.
A guy and his girlfriend got on a bus that was slightly crowded. There was a yeshiva bachur sitting by himself on a bench with only one empty seat next to him. Te girl said she’d get them a seat and goes to sit next to the bachur. He kept on sitting there. Finally she asked him aren’t you not allowed to sit next to a girl? He turned to her and was like, “yeah only pretty ones.”