Those who prefer to have children of the opposite gender, why?

Sometimes I'll hear women say they prefer to have a son/all boys, and vice versa with men who prefer to have a daughter/all girls. I don't think there's anything wrong with it, but I'm wondering the reason why it would benefit you, and how you would feel about having a child the same gender as you.

Those who prefer to have children of the opposite gender, why?
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