Why is maturity, acting and being a grown-up, more attractive in men than it is in women? why are guys, men?

Anonymous
expected to be the more mature gender, the gender that acts like and is a grown-up, is self-sufficient, responsible, etc. Don't give me bullshit or crappy answers that say it's just the way it is, I believe just about everything in life has a reason, or reasons behind it, can be explained. If a man(as in human male) is acting like a child, people won't respect him, if a woman(human female) is acting like a child, people won't care usually, she can get away with it.
Why is maturity, acting and being a grown-up, more attractive in men than it is in women? why are guys, men?
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