It's certainly understandable that you'd want to try before you buy one of these investment-quality, do-it-all toilet seats. While some showrooms may have working demonstration models, it can be a bit disconcerting testing them, with everybody knowing what you're up to behind closed door.
In his mandated pursuit of continuing professional education, an architect friend came across this interesting resource: a list of restaurants whose facilities feature the Washlet. Anonymously experiencing its hygienic functions under such semi-public circumstances could, paradoxically, afford a modicum of privacy. totousa.com