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Well, there is no real PvP in the sense that most MMORPG players think of it; however, the entire game is centered around sims interacting with other sims in social settings. If you want to try it out for yourself, you can download the game here and try it out for yourself for two weeks free! You've got nothing to lose!
PVP is great, have to join a mafia family and drop your IQ about 80 points to play though
There is no PvP in The Sims Online. If you want high class action, you can always join a real life gang.