I like small but shapely. For me it has to be a small waist curving into an ass (arse) that I can get hold of.
My wife's butt is very flat & her breasts (A cup) are a lot more noticable in size. But she is rather skinny all over thou. Her clothes barely show her butt shape at all - but she tends to wear clothing that hides her parts she doesn't like the look of.
I like the lady to have a favorable hip-to-waist ratio and some nice curve to the bottom of the cheeks. Also I really like if they have a deep crack; "ass cleavage" if you will. Like you couldn't see her butt hole unless you or she spreads her cheeks. That's HOT! :sunny:
Nice. I like naked ass when she bends over, exposing her a-hole and vagina. (IMO, ass looks much firmer when bent over than standing.) (E.g. http://www.imagebam.com/image/dfa0b4229002725)
Naked, on all fours, lubricated and available for me to finger, tongue and fuck. Anal beads are always a good idea too!