Hiromi Ozaki's Penis Cybernetique is a prosthetic John Thomas that rises and falls with the user's heart rate. It emulates what it's like to sport a penis, albeit one that was rendered on an Atari 2600. NSFW for geometric nudity.
Here's how Ozaki explains her project at her site, Sputniko:
The project draws inspiration from Open Prosthetics, a movement to make designs of prosthetics (which are currently mostly commercial and expensive) accessible and open source. It seems logical to think that the design of something so immediate - our body- could be accessible and modifiable by ourselves, but how will those designs evolve outside of science, medicine and military? How will the amateur culture manifest in the design of bodies, will we begin to see prosthetics designed for extremely personal uses, for comfort, obsession, crime, sleaze, curiosity and pleasure?
Penis Cybernétique is a process of myself, a 23 year old student, mixed Japanese/British, 173cm height, designing a prosthetic simply to fulfill my own curiosity: "What does it feel like to have an extra body part (in this case - penis) which reacts to my emotions?"
In collaboration with scientists from Imperial College and University of Reading, a motorised pseudo-penis which moves up and down based on my heartrate was designed, built, worn and tested. Will my new body part make myself act differently? Will I get a phantom limb afterwards? Will other people try my designs? What does it mean for an amateur to 'open source' her body?
Yes, the Penis Cybernetique is open source, so you too can code a choad. Also, a less polygonal model is in development. It's also worth noting that Ozaki also dreamt up the Mensturation Machine, a device which offered anyone and everyone the thrills of menstruation on demand.