MarkPhoenix:
CrimsonKidCK: Has anyone ever suggested how super-powerful Clark Kent ("Smallville") could end up on the receiving end of a good buttwhacking? (I don't remember any, even though IMHO his personality isn't all that 'toppish.'
Kryptonite in the paddle. Or, given your particular preferences, you could have his cousin Kara doing the spanking.
Well, the kryptonite ("meteror rocks") would be painful to Clark but it would be its presence near him that would hurt him, whether it was in a paddle that was striking his posterior or not likely wouldn't be material to the degree of pain--in fact, drawing the paddle back to swing, and hence marginally father away from his body, would presumably give him some slight momentary lessening of the pain involved.
However, there was an episode in which trace amounts of kryptonite had the effect of somehow eliminating Clark's powers (he was trapped in an underground tunnel with Lex Luthor) seemingly without point-blank causing him any other discomfort of and by itself. Clark could be spanked under such circumstances, at least within the "Smallville" continuity (which in this case is contradicted by what DC Comics states as the effects of green kryptonite).
Of course, Clark lost his Kryptonian powers on several occasions in "Smallville" (which I pretty much lost interest in once Lex and Lana Lang were gone as regulars), including the brief situation described above, so without his super strength/invulnerability he could be spanked just like anyone else. AFAIK the classic way to temporarily remove a Kryptonian's powers on Earth (which I've used in spanking-oriented fanfiction) would be to somehow change the solar radiation he/she was receiving into that of a red sun (like Krypton had) rather than a yellow one (like Earth has).
However, WITH the full powers of a Kryptonian on Earth, I don't know if Clark could be effectively spanked even by Kara, because I'm uncertain of how much actual pain (as opposed to applying mere force and impact) one superpowered Kryptonian could cause another. Remember Superman fighting the three evil Kryptonians in the "Superman II" motion picture? They were knocking each other around all over the place, but I don't believe that they were causing one another any true pain.
Kara (Supergirl in the comics) was/is a very attractive young woman and she could easily restrain a normal Terrestrial human and spank him/her, but IMHO it wouldn't be as much fun being corporally chastised by a pretty female who was smacking my seat (bottom bare or clothed would be effectively immaterial) with perhaps two percent of her total strength... --C.K.