Why men has penis and women has vagina?

well my theory is that men were given the penises for dominance and men are the protectors so its only right that you have the tool that penetrates. Women are the receivers, we keep you warm inside our hearts and walls. lol this is a load of bull. lol sounds good though.
How could be men be protectors when vagina actually serves as a protector of penis while it's in?

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