Guys who stare with no expression? What does it mean?

Anonymous
Some of my guy friends just stare at me I've caught them staring and won't look away even after I catch them. And they have no expression on their face. One of my guy friends have mentioned to me that they know I get frequent stares. And I just want to know why guys do that?
Guys who stare with no expression? What does it mean?
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