Great idea.
I've been fantasizing about a machine like this for years. In my fantasy there are sensors which measure the muscle tension of the anal sphincter. The more relaxation, the faster the penetration.
And there are sensors which measure the level of the arousal. The more arousal the less stimulation. 
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Male, 25, strght
 Likes: Edging, T&D, Bondage, Orgasm Control, Crossdressing, Hypnosis, JOI, Femdom, nipple play, anal, edging,
 : Toys: nipple clamps, Aneros helix, magic wand, dildo,
 Dislikes: Pee, Pain,
 Limits: permanent, public, cam, poo, illegal, family, health risks,
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