Why are terms like spaded, bull, bred used

[bohica696989]

At one time spade was derogatory towards black men. Why would black men want that to be associate with them.
Bull is a male bovine. Why would men want to be associated to an ani mal.
Bred is what you do to animals usually to get more or better animals. Why would women degrade themselves to the level of an ani mal. Why would the men want to be considered doing a ani mal act.
So why does this not upset anyone?

 

[Brasidas]

 

[bohica696989]

For some the degradation, objectification, and fetishization is a large part of the appeal.
It intensifies the fantasy/reality.

If you look back into history in the south some of the advertisements in auctions of black men and women was good breeding stock. So why not use the term insemination?