Ah to glance or not to glance. Mostly I do agree we men do tend to look more and far too many tend to leer or stare. This is not proper and very hard to fight for most, but men are not using this to meet the right lady so much as a lady for the moment.
Perhaps is more acceptable at a bar where ladies are troll for men (and the opposite) as opposed to a place where one is trying to get the days chores done. Personally I have caught men and women staring in the past. The ladies brought a smile to my face the rest were just a bit scary.