If you check the text of various states, you'll see that it basically deals in 'forced hazing' not hazing where the person being hazed has actually agreed to it. Its also worth noting that almost every description of what is illegal under the various state laws mentions somewhere 'forced' or 'coerced'.
Is your site forcing or coercing people in to being spanked? If not, then it isnt illegal, its that simple.
Regards,
Lee
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