Plumbing Issue

Why do bidets (European arse washing things, for you yanks) have plugs? My father claims its so people can admire their shit, but I highly doubt that. Why is this?

A bidet is a bath, not a shower. Of course it has a plug.

Nobody bathes in turds. I wouldn’t want to bathe in place where my (or anyone’s) poo has been, and I doubt anyone does. Who bathes in a bidet anyway?