If you really want to set it further in the future, make it a robot that walks upright and can give a woman head.
Since most robots are currently designed by men (especially in Japan), that WILL be a ways off...
Proof that girls have no idea how guys think. a robot getting off a girl would be hot, therefore some guy will want to see it, so it cant be all that far off.
A few years ago I was in a god-awful Johnny D's (aka the world's worst diner chain) and for some reason they had some movie on HBO playing on the TVs. (Why a diner would get HBO, I dunno, let alone why you would put a movie on the muted TVs at a crummy diner...) Anyway, the movie ended and on came HBO's greatest contribution to humanity - "Real Sex," and an episode dedicated to fucking machines, no less. So here we are - a crowded diner, about 11 PM, and all the TVs are displaying an artificially endowed blonde, strapped nude to a table, pretending to enjoy being penetrated by an unholy crossbreeding of a lathe, a plumbing snake, and Johnny 5 from Short Circuit. And none of the patrons complained. The moral of this story? Johnny D's customers are pervs.