I'm pretty observant. I can't imagine a single person that I looked at has slipped through the net tbh. Women do notice these things. We have done since small girls. Just because we haven't said anything, didn't stare at you or didn't make you feel uncomfortable, don't think we didn't notice. We did. Its a woman thing.
Human evolution helps us know.
We use touch, sight,sounds and smells to differentiate males from females because males are a risk to us.
I can smell males, I don't even need to see them.
I gather males can't smell other males as well as women can.
I can smell what I describe as a bollocks smell, if a male has been in a closed room for over an hour.