What is the intention of girl hitting a guys balls?

What is the exact intention of a girl when she hits a guy in his balls during a heated argument / fight or to punish him for some wrong deed?

To cause maximum physical pain with less effort
To cause damage to his ability to reproduce
To hurt his male ego and give him emotional/mental pain
No girl in her senses does that in normal scenarios... unless it's life and death situation
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What is the intention of girl hitting a guys balls?
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