“As a man, one experiences very heavy socialisation from an early age to constrain violent impulses. Agression is channeled out of us in every way (other than on the sports field) which is absolutely correct of course. Anyone who hits another person is a criminal. And all the more so with regards to girls – you never, ever hit girls.
In fact, spanking is okay (great!) because it is highly ritualised, that is, has associated codes and rules which define actions and limits (the key ones are bottom only + consensuality). It is okay exactly in the sense that other code-constrained violence, notably contact sports and martial arts are okay. These also allow and imply consent to violence-within-the-rules. The rules make the violence productive rather than destructive.”
From How to get the spanking you want from Art of Authority