Do boys and men get self conscious taking their shirts off even if they have good bodies?

The other day in PE the pump in the pool broke when the boys were meant to have swimming, so they had to join the girls lesson in the gym instead, and wear their swimming shorts. Some of them seemed much more shy and quiet than they usually do, do you think that's because they had to take their shirts off in front of us? Maybe it was a bit awkward for them (though to be honest we weren't complaining haha)?

Do boys and men get self conscious taking their shirts off even if they have good bodies?
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