- Because it is very painful; and
- Because it is incredibly humiliating.
The humiliation of a grown man (particularly if he is straight) getting his bare ass spanked by another man is more than most guys can tolerate.
Whereas they might try to endure another type of physical challenge with pride, spanking is degrading as well as painful.
This is what makes it such a fitting and effective punishment and one that is so enjoyable and satisfying to carry out. Getting a straight guy to present himself really makes my cock twitch.
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