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Even if the technology vastly improves and if Alexa and I can one day consummate our awkward phone conversation, I don't think teledildonics is the next generation of pornography. Perhaps it might replace 900 numbers, with men paying to control the toys of women they can see on their screens, but that's about it. Most people will still want to enjoy their sexual fantasies alone, because even a programmable robot is going to be just an annoying, unsuccessful intermediary--not to mention a very difficult thing to hide in an underwear drawer.
And as far as real sex goes, no high-tech device can ever replace a living, breathing person. Because even if a machine felt real and looked real, it could never reproduce the real thrill of sex: knowing that another being is freely giving herself to you and that at least for a few minutes, you're not alone.
Now, why couldn't I come up with something like that when I had Alexa on the phone?