Hmmmm...How about Lwaxanna Troi (Majel Barrett) spanking her beautiful daughter Deanna (Marina Sirtis), who certainly had a nicely-rounded derriere (not entirely hidden by the clinging dresses she wore) on "Star Trek: The Next Generation"?
Of course, in some situations it seemed more as though Deanna should be paddling her mother, who could be quite childishly stubborn and self-centered at times, but Lwaxanna was undoubtedly a strong-willed woman and IMHO would've been a strict disciplinarian to her daughter if necessary.
A telepath (Lwaxanna) or empath (Deanna) could undoubtedly be a highly effective spanker, knowing exactly when the spankee was in the proper emotional state of genuine submission and repentance. "Don't tell me you've had enough already, I know better than that!"

--C.K.