All at Kotaku (image via):
* Not a sex toy — to some: Suggestive Rodeo Riding Machine Shame!! (thanks, Praemedia!)
* How Did This Erotic Tentacle Game PS3 Port Do?
* Anything tagged to-loveru (warning: milk-squirting)
Then, I just ‘happened’ to find “JAPAN Games “Bouncing Breast” special”, which gets good at about 1:05:
You should check out some of the older X-play podcasts, there’s at least one all about breast physics and at least one or two on the Girls of Dead or Alive.