Do guys really feel shy being shirtless around female friends?

One time, I was at my guy friend's house talking to his mom when he had just woken up and came out of his room without a shirt on. As soon as he saw me, he immediately ran back to put a shirt on. ๐Ÿ˜‚ It made me wonder, do guys actually get shy about being shirtless in front of girls, even if they're just friends?
Do guys really feel shy being shirtless around female friends?
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