This should have been a pole... spit or no spit?
I'm a big NO on that one
I'm not buying the lubrication theory.. especially when a girl has spit in her mouth already when she's suckin a dick. Not really any lube needed for a blowjob.
It's all about contour and proportions. A nice ass is usually rounded and in the shape of an upside down heart. The asscrack should cover at least 75% of the vertical area. A too short ass crack is bad. A box or square shape is bad. The profile should be nicely rounded and never flat or...