There's a point on the Uncanny Valley when a humanoid robot turns from something "friendly" into something terrifying. An example of a robot that would naturally register as non-threatening would be Star Wars' C-3PO. We can still differentiate between computer and human at that level. It's familiar to us, but we know for a fact that it's non-human. Even though we see these robots in such a way, is it possible that we could associate them with a deeper emotional response?

Humanoid robots can sense the world around them, move their bodies, and interact with people in ways that are similar to the ways that real people interact. But a robot's "human-ness" is (at least for now) all just a simulation. It's a combination of clever software, and in some cases, hardware that's designed to make it easy for us to fool ourselves into thinking that some glorified box of circuits is even a little bit like a person. We're very, very good at fooling ourselves like this, to the point where it starts to get a little weird. Researchers from Stanford University will present a paper at the Annual Conference of the International Communication Association in Fukuoka, Japan, in June, with the title of "Touching a Mechanical Body: Tactile Contact With Intimate Parts of a Human-Shaped Robot is Physiologically Arousing."

Humans become aroused when touching robots in sensitive places, a new study has found. Far from seeing robots as just computers, humans can become physiologically aroused from touching a human-shaped robot in private places like their eyes and buttocks, the Stanford study found. The results could have huge consequences for the creation of robots in the future, such as ones that people live or even have sex with. It might also help people create "robot stand-ins", that allow people to touch others when actually being there isn't an option, the researchers said. Scientists have taken a leaf out of the script of The Martian by showing how easy it would be to grow your own veg on the Red Planet.