I know it's not for everyone, but wanted to mention the shewee/he-wee too. Whether it be when you're camping, public restrooms(where you wouldn't have to explain the direction your feet are facing), or every day life.
[ame="http://www.amazon.com/Shewee-SHEWEE/dp/B001OTE9L2"]Amazon.com: SHEWEE: Sports & Outdoors[/ame]