Like out of attraction or interest, pretty rarely for me, like I can't recall any occasions. I'm an observer in general though, so I'm always looking at SOMEONE, and naturally a good portion of those people are men. More of a curiosity thing, interest in behavior and mannerisms, scenarios. I'm open about my people-watching and there's a pretty obvious difference between that and if I were looking at someone out of attraction. If I was attracted, I'd be trying to look without looking, seeing without anyone knowing I'm looking except me. So I would appear to not even notice them.
Well I cannot keep my eyes closed forever or stare at my guy the entire time so yes I do LOOK at other men when I'm with my guy. But just looking does not necessarily mean that I'm looking at them with sexual interest or attraction or even admiration.