But finally I found the right website, Jo's Plumbing.com,
and it turns out that Jo the Plumber is a girl!
She works as a spokesperson for Kohler, and on her interactive adult toilet website she invites you to pick various items in a bathroom and flush them down the toilet while groovy jazz porn music plays in the background.
You can flush things like a bra, a hand towel, little bottles of shampoo, jewelry, dog food and a rubber ducky down the toilet. (A pizza delivery never did show up when I was at the site, however.)
She has several provocative lines in the film, like, "stop tickling!", "that was fun, do it again!" "Nice choice", "be serious", and "That's too big!"