Masturbating behind the testicles anyone?

Has anyone masturbated by holding the cock between scrotum and anus? With a full erection if you dig the fingers into the "taint" you can feel the cock under the skin. With fingers on either side of it, press hard and you can get your fingers around a good portion of the cock. Now masturbate! I've done it alone but I've also done it with my wife, each one either holding above or below the scrotum. Both of us can masturbate me at the same time.