Is it bad for a teen boy to wear a girl's underwear if they are

I am a 13-year-old teenage boy and there was this 13-year-old girl at school who was wearing spandex. I could see her panties through the spandex, what should I do? - Quora

What are the different types of boys underwear? What do you wear, and why? - Quora

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Can teenage boys swim in underwear at the beach? - Quora

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If men can walk around topless because of the heat, should women do the same? - YP

What are the advantages and disadvantages for the different types of underwear on both boys and girls? - Quora

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What underwear should a teen boy wear when playing sports? Pictures are helpful. - Quora

Should teenage boys wear boys underwear instead of men's underwear? - Quora