Well I just figure things photobucket's sporadic filter thing is generally pretty good, they will remove asses about half the time. *hence the Hardly, but that also comes from on beaches during the summer you usually can't even see the back of bikini bottom might as well be no ass coverage * Where as female breasts *rather the nipples* and all sorts of genitals would definitely be considered naughty bits by them.
I figure that's a fairly good judge as to what should be linked, or shown as a picture outright. Even though, yes, it's labeled with a warning and technically nothing needs to be behind a link, but bare genitals is something I never want to open up a page to, and I'm sure I'm not the only one...
... Just a tad off base and ranty, sorry.