Why does the nurse always tell the man to leave the room for child birth?

Does it make the man lose attraction for her? They say he will pass out if he watches. Why wouldn't the man want to be there for the birth of his child?
It's really gross
Some people don't handle the sight of blood
Another marxist tactic to destroy family
All the above
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Why does the nurse always tell the man to leave the room for child birth?
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