From robotic vocal chords to robotic lips, Japan has made a variety of robotic body parts over the years. But one body part has always been noticeably overlooked: robot ass.
Not anymore! Enter Shiri. In Japanese, "shiri" (尻) means "buttocks", and this robot is a "buttocks humanoid that represents emotions with visual and tactual transformation of the muscles."
The goal of Shiri is supposed to express the "various emotions with organic movement of the artificial muscles". That's fancy talk for butt movement.
Shiri is above to tense up like butts are supposed to, and it is able to detect your touch, stroke, and, um, slap.
The project is the work of research Nobuhiro Takahashi and the University of Electro-Communications. Takahashi is also working on "self-hugging" rigs as well as some sort of kissing simulator
The above video, courtesy of sister site Gizmodo Japan, gives a breakdown of Shiri. Skip ahead to 2:30 for the hot butt slapping action. Boy, sometimes science sure is cheeky.
本物のおしりのようにぴくぴくと艶かしく形を変えるおしりロボット [Gizmodo Japan]