Couples Playing Together
Playing along with someone you know in real life can make a game quite a bit more interesting, especially if that person is your significant other. It's long been said that couples who play together stay together, and this may turn out to apply to online games as well. Stories about wives that have been turned on to games by their husbands abound on game forums, and you'll even see a few cases where wives have lured their husbands into the hobby.
The flexible character creation in the City of Heroes/Villains has been a hit with couples, because it allows them to make superhero characters that compliment each other both in skills and appearance. The game now has at least one guild that caters to couples that play, which is something we're sure to see more of in MMORPGs.
Adult-oriented Content
Ever since the invention of Internet chatrooms people have been using them to engage in dialogue of an erotic nature. With the advent of 3D games, finding some way to arrange your avatars that vaguely resembles a sexual position never fails to get a few laughs. It was only a matter of time before games were going to start offering interactive environments that cater to these interests.
Second Life, which features a wide range of user created content, now has everything from wedding gowns to red light districts, complete with characters that ply their trade as prostitutes.

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