Your using what sex with s robot would be right now. The post is talking about in ten years. Ten years from now it will be drastically different than a fleshlight or current sex dolls. I would expect it would be able to move on it's own, probably enough to get into different positions. It will also probably be able to respond to commands/requests and maybe even physical movements of the user. And of course, AI can already pretend to be a real person with "some" success. Narrowing that scope from conversation to just sex should enable it to perform even better verbally.