Probably something most of you are aware of to some degree.
http://www.msnbc.msn.com/id/21271545/wid/11915829?GT1=1045I am thinking less of robots and more of AI. Where you don't program it to do things back, it chooses to do stuff back which it thinks would be most stimulating.
I mean, they can already make sex dolls that look pretty bloody realistic.
As for the marriage implications, if it is just as interesting, smart, and attractive as a normal human, would falling in love with them be that hard? Still, the level of AI is an issue, and of course, some people will be inherently freaked out by the prospect.
[13:27:43] [Sabator] peter would be the worst batman ever though. "turn on the bat-signal" "right!" *turns on huge foglight, beams an image of striped pantsu into the sky*