Try making a model out of play-doh. You can get a cheap can of it almost anywhere. Leave it out a couple of days to let it harden. Make sure it's smooth. Pay special attention to the shape of the end that sticks out of your behind. It's going to be pretty unyielding and could seriously bruise you if you sit on it for a long time. It will also have a tendency to break off when you sit down.
Cover it with a large balloon and tie off the end. (Balloons work better for this than condoms because they're thicker. Just make sure that the balloon is latex--most of them are.) If you're up for it, you can also make something that resembles play-doh. A recipe can be found
here.
Problem with play-doh, though, is that it is hard and brittle. It won't last long, but maybe it doesn't have to. A good plug should have some give to it. I don't know of anything right off hand that would be ideal.
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