I am always looking for models and I receive a lot of questions about modeling it's really very simple.
There are only 3 requirements needed to be a nude model.

1. Be at least 18.
   Since I'm making art I could techniquely do younger persons, but if for some reason what I would do is NOT demeed art then I could be put away for a long time.
   
   
2. Be willing to sign a standard waiver.
   This would differ depending on whether you would model for a photography based art form or a non-photographical medium
   
   
3. Be able to take your clothes off with someone else around.
   You would be surprised how many times someone at the last minute finds out they can't meet this last most basic requirement.

Even though my 3 requirements are very simple, there are still many questions about the process.
I've made a very complet Faq Section with everything you've wanted to know about nude modeling.