Burgundy:
CrimsonKidCK:
I'm often irritated when the spanked masculine protagonist in an F/M story is shown as being flawed or personally unappealing--small, short, physically weak or at least nonathletic, nerdish, naive, socially awkward in general, even rather wimpy in the sense of being easily intimidated.
I agree with the sentiment here, although I disagree that the traits your mentioned are objectively unappealing. (For example nerdy and socially awkward aren't necessarily unappealing, IMO.)
I take your point about the spankee being presented as unappealing, though. Personally, I can't enjoy a spanking scene if the spankee is a douchebag, though there must be a niche for douchebag spanking stories out there, since they exist. That goes for both male and female douchebag spankees. I want to like the spankee.
Well, "personally unappealing" isn't the same as "objectively unappealing"--I don't find anything particularly unappealing about a male who's small and/or short, and indeed the guy really doesn't control that (although he could become fitter and better-toned physically via regular exercise), yet many females would reject a 5'3" tall male as a romantic/sexual partner on that basis, while some bullying males might pick on him based simply on his size.
The same would go for a guy who is nerdish and/or socially awkward in general, even though I'd agree that those aren't necessarily unappealing characteristics in any rational sense.
It's probably quite a lot easier to describe the spanker as a mean-spirited sadist or the spankee as a morally reprehensible person truly deserving of a severe butt-whipping, but I usually tend to feel uncomfortable employing those rather stereotypical characters.
(However, sometimes the feminine disciplinarians whom I'm attempting to portray as 'strict-yet-caring' types strike a few readers as being somewhat sadistic anyway, thus I don't always describe them successfully in terms of reflecting my intentions; perhaps that's because the corporal correction they administer is considered a touch excessive, although to me it has to be very thorough to effectively modify the behavior of a strong, healthy teenage or adult male.)
So I suppose my point would be, addressing any *toppish* or *switchish* ladies out there--that fairly good-looking, muscularly-toned, obviously intelligent man might yet be a viable candidate for a pants-down excursion across your lap, fictionally or otherwise...

--C.K.