quicko: levels of water

Australians are a bit taken aback by how very full of water American ... facilities ... are in the restroom.  I also have on my hands a very inquisitorial Australian male who wants to know how men manage to not make a mess, given these circumstances.  I said I really hadn't made a habit of spying on men in restrooms to find out, so if anyone would like to -- delicately -- offer the solution, please be my guest in the comments.