Goodgulf:
Most recently there was one on Community - which was nice to look at (and in Prime Time).
I've seen that one and it's very good--a fairly lengthy (by TV standards anyway) consensual F/F switching on the young woman's bare bottom (although her derriere isn't shown while exposed) by an elderly disciplinarian.
There was a F/m classroom paddling scene (two swats to the seat of his pants) in an episode of "Boston Public" that also included one teenaged female bumcheek being briefly displayed in a reddened (paddled) state. The sixtyish teacher who delivered the paddlings later told a male teacher (also shown as at least in his sixties) that she enjoyed spanking her students' "ripe young bottoms" and that her late husband "couldn't get enough of my paddle" before inviting her colleague to experience a similar treatment himself. The guy recoiled from the suggestion, however, and ended up reporting the conversation to the principal.
There were a couple spanking scenes in "Ally McBeal" episodes, one in which the sexy secretary sang "Run, Run Rudolph" at the law firm's Christmas party--she was dressed in a revealing Santa-style outfit and was accompanied by two lawyers in reindeer costumes, giving each of them a moderate buttsmack or two with a little whip she was holding while singing. In another later episode, one of the firm's partners gave his blonde girlfriend's bare buns (not shown) several sharp smacks with a hairbrush--although she supposedly liked being spanked, she reacted angrily because of the unexpected and nonconsensual nature of his "attack" on her.
"Ask first," I suppose... --C.K.