Girls, is it appropriate for me to go swimming with all females and I’m only male?

I’m a straight guy with an average body and I’m going swimming with four girls all in their twenties and attractive. They are wearing two piece swimsuits and they want me to take my shirt off. Is the male chest not private in US or something? I have no problem swimming with no shirt but want to make sure it’s appropriate with only girls I’m swimming with.

Girls, is it appropriate for me to go swimming with all females and I’m only male?
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