No one held a gun to a puppy's head to make James Marsters film nude scenes in BtVS season 6.
Yes, actually taking a printout from the Wrecked dailies and asking the man to sign it would be an orgasmically asshattish thing to do.
Spreading it across the internet? Not so much. Yes, he objects to it; yes, one can understand why he would, though I strongly suspect it's the stupidity of the sock, not the visibility of his highly pinchable arse that he really objects to, whatever his public protestations might be.
But cat, bag, horse, barn door. The stuff is out there. Looking at it will not deny you the keys to the kindom of heaven, and neither will allowing a posting of it on Marsters Daily to pass without opening your mouth to defend the fluttering virtue of the lovely and oh-so-otherwise-prim Mr. Marsters.