IN YOUR OPINION: What Is The Reason Why Guys Can Go SHIRTLESS and Girls Can't?

There's guys who've got moobs, (and if you don't know what moobs are, look it up. Lol) so really, what's the difference? (I'm aware there's a difference, but...) I'm not saying girls should go shirtless, (I'm not saying guys should too,) but I am wondering, who made the rule? Men can go show off and it's all fine, but if a girl did it, it would be wrong and weird.
I caught myself making an excuse for a guy who was "showing off" voluntarily.
"Well, guys can do that stuff." I said to my friend who was weirded out by him.
And my friend said, (who is a girl,) "Yeah, but it's still kind of weird. Women wouldn't go around doing that."
It made me wonder... hmm?
What exactly is the rule that guys can go shirtless and it's excepted and girls cannot?
What do you think?
IN YOUR OPINION: What Is The Reason Why Guys Can Go SHIRTLESS and Girls Cant?
IN YOUR OPINION: What Is The Reason Why Guys Can Go SHIRTLESS and Girls Can't?
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