Within 20 years we will have headsets which will deliver electromagnetic pulses directly to the pleasure centers of our brain. The sensation will be many times more powerful and pleasurable than sex. And instead of 10 to 20 minutes of pleasure each day we will have 10-12 hours of overwhelming pleasure every day. As soon as this is available many of our world's problems will go away, abortion rates will plummet as almost nobody will have sex unless they are specifically trying to make a child. Sexually transmitted diseases and rape will be a thing of the past. Male aggression will almost vanish which will directly lead to lower crime rates. Drug abuse will go away as the headsets take over. Our society's addition to sex will fade. And since we'll all have self-driving cars we can use them during commutes.
Larry Niven called them wireheads. We'll see them everywhere, we will be them.
Update July 12, 2012 Article from The Week on electroneural stimulation. We are closer than I thought.