My little sister was staring at me without a shirt. Is that normal?

Anonymous
So I ran on my treadmill shirtless and came out of the little workout room we have and grabbed something to drink and I saw my sister checking me out. I looked at her and she quickly looked away. I'm 21 and she's 17 by the way. Is that normal to checkout your brother without a shirt?
Yes
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Noooo
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My little sister was staring at me without a shirt. Is that normal?
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