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Is a fetish thing to do. You hold the man's cock and take his nutsac and slap it until he tells you the safe word or if he bleeds. It is also used by gays,hetero and sometimes girls with cocks.
Gasser nut spanked his boyfriend will he nut spanked him back.

That hooker was a good nuts spank because she had a cock of her own.
by AJ Khalifa January 10, 2010