It was awhile ago (10+ years), but I swear I remember seeing an article on full sized sex dolls that mimic their partner to some extent, so you could technically have sex over the internet. I think another idea was to be able to link it up to porn and it would mimic one of the people while the video played.

So it probably does exist but in its current form is to expensive for the average joe, but people are still working on making it more robust and affordable to the general public.