Although sex is not built-in in Second Life, the open-ended nature of the game allows residents to come up with in-game activities that emulates sex in the SL universe.

One site even has a product that allows users to connect any DirectInput Force Feedback controller to their computer and control the force feedback functions from the game itself.

As with its predecessors like IRC, cyber sex is very rampant in the Second Life universe. In Second Life, your character can assume poses as well as perform virtually limitless animations. All scripters who are interested in performing virtual sex have to do are create animations resembling a sexual act, loop it and uload it to the game.

Now, what people usually do to initiate sex in second life is click on what is known in second life as Pose balls; by having any character touch a pose ball by clicking non them, the character immediately begins using the animation attached in that particular ball. And this is pretty much how sex is done in Second Life. One user touches a pose ball embedded with a sexual animation adn the other touches another ball; all of a sudden the two characters are having sex.

This article further describes sex in second life.