but this situation does not occur out of the blue. So unless there is something going one between the two men, men will not stare and rarely look at other men.It is more threatening for women than it is for men though.If it happens, I never notice.
i'd disagree, men use prolonged eye contact as a direct challenge to other men, so if a man is staring at another man it is usually with aggression, whereas women are often leered at, which is unsettling, but not dangerous in itself.
When a woman stares at another woman it doesn't usually signal imminent violence, or intimidation.
And gay men that look, tend to be a bit cheeky about it, but not really stair. A stair would most likely produce aggression on the non gay man being starred at. Even with gay men, I've only been glanced at, not stared at, and they generally smile, though for me to have noticed, it was more than a quick glance so as not to be caught.
It does in lower socioeconomic areas. If you look at someone the wrong way or don't avert the eye quick enough you'll be attacked.