Why are guys so easily seduced?

Smiled at a cute guy today. A lot of naughty thoughts passed through my head as I did it, but I'm naturally of a shy and sweet disposition, so I looked away... Then I looked back up at him again. Same smile.

He was quite taken with me, as evidenced. We aren't that close; I've worked close with him once or twice. Why are guys so easily seduced?
Why are guys so easily seduced?
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