As far back as in 1970 a Japanese scientist, Masahiro Mori identified the psychological trend of the human mind to become more attracted to the robots when they become more human-like.

Mori’s original hypothesis  of the “uncanny valley” states that as the appearance of a robot is made more human, some observers’ emotional response to the robot becomes increasingly positive and empathetic, until it reaches a point beyond which the response quickly becomes strong revulsion.

This area of repulsive response aroused by a robot with appearance and motion between a “somewhat human” and “fully human” entity is the uncanny valley. The name captures the idea that an almost human-looking robot seems overly “strange” to some human beings, produces a feeling of uncanniness, and thus fails to evoke the empathic response required for productive human–robot interaction.

What is of interest is that one of the most possible underlying motive is mating selection, which in itself could put the future generations in existential danger as soon as they are developing outright arousal for sexy robots, leaving the cumbersome process involved with real humans… 

And that is when we enter the long and dark dawn of a new era… which coild easily be the dusk of our race as well.