I have never seen a provider doing this so far, but with a new crop of teenage girls up and on the way to the age of majority, it's only a matter of time before it appears on e.com or a showcase... I bring to you the millenials' answer to sex appeal... lip convulsions...
A little ditty about the phenomenon, not for the aesthetically sensitive
http://www.youtube.com/watch?v=q0ohT89flgc