Genetics, to sum it up in one word.
I don't believe in these certain personality traits that "make a man a man". Bravery, honor, loyalty, the inner-strength to overcome whatever we face in life. These are all things that we should all have, not as men or women, but as human beings.
English
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-claps-
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No need to clap, it's nothin' special. Just common sense. :P