Why do a group of men stare?

Why do a group of men stare?

Today I went to the supermarket and a group of guys were talking, quickly pass there was a semi-annual silence and they stared. I've already learned not to be upset, but it always generates a bit of intrigue. When women are among friends or colleagues, we do not pause because a man passes by or suddenly is in the crosshairs.

It is something of the genre, what is the reason from your impressions?
Why do a group of men stare?
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