My main concern regarding a bidet is that it'll leak. I've heard horror stories about bidets causing thousands of dollars worth of damages after the water hoses that supply them leak and spill hundreds of gallons of water on to the floor when their owners are away from home.
My friends were (rightly) concerned their two year old would think it was a new bathroom toy. He loves playing with water. I didn't have a good answer, but somehow kids in asia seem less enthusiastic about playing with something they use to clean their bums. Also, the majority of the bathrooms there are more like giant showers... they have floors with drains in them so the whole thing can get wet without any problems…
It would be a major issue in the US as that water would just leak through the floor.