Why do men slap women ass when fucking doggy-style?

I am just curious why men do this, and if women preferred to be slapped, and why?
I believe it is because doggystyle is a male dominant position. The slap is another way to assert dominance. My wife likes to be slapped by her bull and I love to watch her being slapped by him. My wife likes to act subservient to her bull and I think that is part of.
 
Now that I think about it my wife slaps my ass when we’re in missionary. She’s never asked if it’s okay to slap my ass. She just does it. But then I have to admit she seems to take a dominant role in our sex.
 
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