From reddit: I love catching guys staring at girls.
"I am a heterosexual male so I get it. A good looking girl walks by and you look. But don't be a creep and stare too hard.
When I see a guy like that, I stare at him. It's usually at the gym, but I do it anywhere I am out and about. He will be checking her out and then, you know how you look up and act like you weren't staring? That is when we make..."