How Realistic Would a Robot Have to Be for You to Have Sex with It?

Implements for human-robot relations already run the gamut from abstract Fleshlights to fully-articulated, Uncanny Valley-straddling love dolls. But is more realism always better?

That is, if properly equipped, would an android from U.S. Robotics still be as attractive as, say, a Fembot? Then, what about a Hookerbot from Futurama? It's a slippery slope, to be sure, but essentially when does hanky-panky with an electronic being turn into humping a VCR? Let us know what you think in the comments!

Image: Svedka