Balls

I don't know if I am the only one who is unsure of something because they heard from some unremembered source that an object is used for something intimate. I consider myself to not always fall for that kind of stuff- but ever since I was young I could remember playing with these balls that were about the size of a ping-pong ball and they would chime. I swear to God someone told me when I was around 12 that they were used for sex. So every time I have seen them deep down inside myself I think that. Plus, as the picture shows they come in a sexy little case...
So anyway I typed in 'Chinese balls' tonight and instead of getting pornography or sites that promoted alternative uses for them- I discovered that they are called Baoding balls and they are supposed to be very beneficial to health. If they are used for other things other than what Wikipedia says I don't want to know...