chandra:
Diverges wants stories mentioning buttocks. I agree with him. Description of the shape and structure of buttocks, before and after spanking.has lot of erotic value. I also wonder why present day writers feel shy in writing BUTTOCKS. They rather use the term bottom pr backside instead which does not give the same kick so Io say. Is the term buttocks considered obscene? In India.the word is freely used during mutual conversation........Chandra
Well, I'll use "buttocks" occasionally in written description, as I will "posterior" and even quite rarely "hindquarters," but those terms aren't used much in direct conversation, at least not where I live (Texas in the U.S.A.), so I tend not to have my characters employ them in dialogue--although if the speaker is portrayed as a very precise, persnickety type of individual, then he/she might say "buttocks" or "posterior," especially while giving instructions or making a formal statement.
If I'm replicating first-person written material (such as a letter or diary) by a narrator/author, then I'd feel somewhat more comfortable with "buttocks" or "posterior" being used once in a while.
There are numerous synonyms for the human buttocks which I include in my stories, but my most-employed favorites would be "bottom" (naturally), "behind," "rear end," "derriere," "buns," "seat," "nether moons" and variations of "cheeks"--"asscheeks" and "buttcheeks" primarily. More colloquial/cutesy terms such as "cheekies," "caboose," "south side" and "southern hemispheres," I might use them in conversation (depending on the character speaking) yet rarely in exposition; the same would be true for more blunt terms such as "ass" or "butt," which I'd usually add "-cheeks" to for description rather than dialogue.
As to the original thread topic, I do much prefer reading (and thus also tend to write) descriptions of the spankee's derriere, before, during and after a sound chastisement, not merely its size and/or shape but also changes in coloration and/or topography (surface features) and even physical movements--twitching or trembling nervously beforehand, squirming and/or bouncing under impacts while being walloped, quivering afterward. Finally, there are the sensations involved--a feeling of vulnerability caused by baring and punitive positioning, then the sting and heat during the spanking and later the soreness (along with residual hot stinging) once it's over.
(In a third-person account or a first-person one one narrated by the spankee, the physical sensations can be directly described, but even in a story narrated by the spanker or a witness, those feelings can be postulated: "From the way Nelson was wriggling his hips and howling like a banshee while his girlfriend eagerly plastered his glowing crimson asscheeks with her sorority paddle, his chubby caboose must have been totally 'hurtin' for certain' at the time.")
In my F/M accounts, I generally prefer to describe the targeted masculine posteriors as both fully-rounded and muscularly toned, making it somewhat of a physical challenge for the feminine disciplinarians to thoroughly thrash them with full effectiveness, plus a psychological one for them to completely break down their spankees' emotional resistance.
Fortunately, the ladies always appear to impressively rise to the occasion...

--C.K.