ask are the sites owners. You can get the email address here.
http://www.democraticunderground.com/forums/rules_detailed.html I don't have a problem with these but this is a website and sometimes people tend to go overboard on the web. Kind of strange to me that you posted the photos before getting an answer from the site admins. You've been a member of the DU long enough to know who to ask and how in spite of your low post count.
The first one is pretty good though it could of used a bit more light on the right side of her face. Something seems off about her lap. Blur added for web or from resizing? Hard to tell.
The second one is almost useless to post at the size it is on here.I can see you have a few poses that might be good and they might be well lit but they are so small you can't really tell for sure.
The third one is better lit and works well if you are doing a class assignment that requires you to copy a few hundred other images already done by other photographers.I've lost count of how many times I've seen the same pose and crop. Not knocking the idea, copying what you see of others work is a great way to learn posing and lighting. I just don't see it worth risking getting tomb stoned if the site admins decided that nudes are a not allowed on their site.
I would suggest again you run the idea by Skinner before you post anymore.