Oh man. I was just reading this:

No pornographic images
Because this site is not designed strictly for adults, there is no nudity allowed in the forum. Slight see-throughs, obscured shots, and nipple slips are considered acceptable, but fully exposed tops or bottoms are strictly prohibited and must be linked to. If something is borderline, link to it with a warning as to the content, or PM a mod before posting.

Additionally, if you're about to post something that could cause trouble for users browsing while at school or work, add a "NSFW" (Not Safe For Work) tag to the subject line. Sometimes a NSFW image will come up in the context of the conversation and be appropriate to link to with the label NSFW.
I thought the site was for 18+? That's an adult. And i love how detailed they go into what's acceptable. NIP SLIPS ARE COOL, EVERYONE! Oh man, here comes my wet t-shirt contest!

P.S. +1!