The Holodeck from Star Trek and also the matter replicator.
First, the Holodeck. Only as long as porn does not get banned from it. That might actually happen because on Star Trek they never showed anybody go at it. Sure, they play pool, interact with fictional characters, or ride horses. But you never see a dude do two chicks at the same time. I guess in the future you still need a million dollars for that.
Second, the matter replicator. After you are done in the Holodeck you don't have to go make your own sandwich. Chicks won't do for you any more. They get all feminist now. Of course you still HAVE to take them to IHOP in the morning for breakfast. God forbid that feminist has to pay dutch. Don't I know that as the dude I am still obligated to pay for breakfast.