Female urinals on Amazon...
Maybe if I were on the Space Shuttle.
I like to keep it simple.
That said, I would consider a Shewee if I were backpacking in Morocco again... the toilets in African countries outside of European hotels are completely foul... plus with all the HIV and Hepatitis it could be a health issue.
I rather enjoy relieving myself in nature... back in college we called it "communing with nature". Some things are sacred about camping and this I consider one of them!