It was manufactured sometime between 200 B.C. and 400 A.D.
It's not a doughnut.
It's made out of bronze in two pieces which were fitted together.
It was inserted into a body orifice.
I could tell you the answer, but it's more polite to send the traffic to the site where I found this. If your French is a bit rusty, you might prefer the Babelfish English version.