SNM:
flopsybunny: Excuse me while I go look in the mirror to check whether my buttocks are callipygian or Steatopygian
Those aren't mutually exclusive. :D
True, because if they're spheropygian (fully rounded) many fanciers of feminine derrieres would undoubtedly consider them both callipygian (beautiful) and steatopygian (pleasingly plump, to look at it positively).
Within reason, IMHO there's no problem with a guy having a bit more womanly posterior opulence to pat, squeeze, fondle, pinch, kiss, tickle and of course...uhhhh...let me think...what else...??
I can't remember the last action I was going to mention--damned short-term memory loss...

--C.K.