I make sure to only buy vibrators and dildo't that are smaller than or equal to my girth, half of them are longer than my 6.5", but I don't have a problem with that. We are hoping that someday she will be able to build up to the biggest girth dildo that she has because that is my size, 6.25". She has never bought a vibrator on her own, however the first one we ever bought came from an adult store in Missoula, Montana in the late '70's where she picked one out, and being her first it was her favorite until it died many years later, it was about 4" in girth.