This thread closed to avoid confusion. The no-nudity rule was only temporary due to specific direction from Ning. The site has been reverted to its previous rule allowing nudity but not porn. Please see the announcement thread here
Some of you don't seem to be understanding the very very basic rule prohibiting nudity of any kind on the site. You seem to think you are somehow above this rule because your specific image is the single special exception to this. You seem to think that because your image of a bare ass is tasteful the rules don't apply to you. You seem to think that immediate banning for violation of this rule is harsh.
Let me make it abundantly clear what I mean when I say your ignorance or disregard of the rules puts the entire site at risk:
"Networks with Adult Content visible to Users who are not Network Members of such Networks with Adult Content may be shut down at Ning's sole discretion and without notice." (from Ning's TOUs)
As a public site that means any content posted here is "visible to Users who are not Network Members". Let me repeat that: each time you post adult content (any image with nudity, yes any, yes yours, no it doesn't matter if you think it's "tasteful", no it doesn't matter if we disagree with this) you risk the entire site being shut down. That's right, shut down. As a direct result of your content which Ning considers "adult content". Again, it doesn't matter if you agree with this rule, the site can still be shut down because you violated it.
If you thought that being labeled "adult" and slammed with explicit porn ads on every page was inconvenient, imagine how inconvenient it will be when there's no site at all.
This is why violating the nudity rule is a first-time banning offense. It's not to be unnecessarily harsh, it's to try to prevent the site from being deleted entirely. If you cannot or will not abide by the rule you must be removed out of fairness to other members.