From our "somewhat unsafe but who cares it's cheap and does the job!" department:

Well, it's got a remote, and it's got a motor, and it's $40. However, you'd also need some sort of trusty extraction mechanism to get it back out, but once you figure that out (I refrain from making the obvious suggestions so that I won't end up in "stuff I stuck up my butt 'cause of qDot" court), hey! It's $40! Other remote mechanisms sell for way more, and this has a DIRECTIONAL remote too! Nothing says lovin' like fucking with your partners sense of balance (assuming the motor is actually that strong and that you could feel the direction, but really, anything good with a remote used on someone standing should fuck with their sense of balance).