In Germany there are laws saying when you run a business and sell food and/or drinks to people AND
offer them seating, you must offer a toilet free of charge. There are some very interesting rulings and comments on those rulings in legal literature. They´re fun to read because there are lots of interesting wordings to describe certain, well, bodily functions. (If any fellow Germans happen to read this, ever heard of "Spontanentleerung" or "Stuhlverhaltung"
Let me share a story: I was on a local train, returning on a Saturday night from a winefest. The train was packed with shitfaced people, the single loo was out of order. So this guy takes out his near empty Coke bottle (1.5 litres, plastic), burns a hole in it with his lighter and pees into the bottle through this hole.
Do you want to see scenes like that on planes too?