Actually Mythbusters "kind of" proved it. They took samples on all the surfaces in their shop.. table tops, sinks, toilet seats floors.. the cleanest (by FAR) was the toilet seat.. oh, and the dogs mouth..
And if crabs are your concern, i don't think a paper assgasket is going to help..
So basically if you piss on your table at the restaurant, it will probably be cleaner then if you didn't.
I'm still amazed, working with "educated" people, how many don't wash their hands in the restroom..
You better be disenfecting those keyboards, number pads on phones etc..