The nursing home I used to work at got a ton of healthcare-supply catalogs, and on the night shifts when there was nothing to do I'd leaf through them. Mostly they were products like diabetes socks and grabrails for the bathroom, but each one had a page or two for "intimate care products." One of the catalogs was actually hip and had Natural Contours vibrators and said pretty plainly what they were for.
Most of the catalogs were... not hip. And so you got this:
I think I'm underestimating the hipness of old ladies here, but I always wondered how many people really did use it on their neck. You know someone did.