Email from Ebay Customer Support on March 5th, 2009 

(...)

Listings for artwork depicting nudity are allowed in the Art category,
but *only* if all of the following conditions are met:
- The seller must enter "Nudes" in the Item Specifics section of the
Sell Your Item form (located in Part 2 of the form).
- The item can't be sexually suggestive or described in a lascivious
manner.
- The listing doesn't contain more than two images of nudity.
- The item is considered fine art or professional art (for example,
vintage pin-up art and Renaissance-era paintings or sculptures such as
works by Michelangelo and Raphael).

-- Important --
Vintage pin-up art and photographs (pre-1970) depicting full frontal
nudity must follow the guidelines for general artwork described above.
However, vintage pin-up art and photographs containing topless or
suggestive images can also be listed in the following categories:

- Collectibles > Paper > Pin Up > Vintage (Pre-1970) - Pin Ups
- Collectibles > Postcards > Risque
- Collectibles > Photographic Images > Antique (Pre-1940) > Risque

For more information about our Adult Only policy, please go to:
ebay adult policy

We thank you in advance for your cooperation, and wish you luck with
your future eBay transactions.

Sincerely,
eBay Customer Support

ebay reference: LPORC002 - Response to your email concerning eBay's ended listing policies. (KMM317608600V50458L0KM)