Why were they staring at me?

Today I was hanging out with a few of my friends when I noticed a couple of guys staring at me a couple of separate times. I wasn’t dressed up or anything, quite the opposite actually. I was just in a baggy red sweatshirt, yoga pants, a messy bun, no makeup, and wearing my glasses. One of them even watched me sip from my water bottle’s straw, which I’ve heard is like something that some guys do while imagining you doing something more dirty than just sipping water? Anyways, I just was wondering why they were staring? I know the only people who can really provide an answer are those guys themselves, I just would like to hear input from others about this.

Why were they staring at me?
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