The POTUS may be Commander in Chief, but he is not a member of the U.*. Military, therefore he is not punishable under the UCMJ

http://usmilitary.about.com/od/punit...*/a/mcm125.htm

This is the Article about sodomy. Doesn't say anything about missionary being the only thing you can do. It does however, say what you can't do.

As I read it, unatural is still something that can be broadly interpreted by the JA. And decided on a case by case basis. Yes?

Yes, you are correct. Though to be honest, I've only heard of one hetero couple that was charged with violating Article 125, but it went hand-in-hand with other things they shouldn't have been doing that were illegal...Military or not.