I'm not sure about the vibrating ones, but as ben wa balls are used for toning, you do need to have them in often. But they're not as orgasmic as you think (I wish!). You feel them inside of you and need to work at clenching your muscles so they don't drop out. They do make the hoovering much, much more fun! I know people go outside with them in, but I'm too scared, and they can set of shop alarms!! Embarassing!!