I've seen everything from one for The Sims 2 which added horses to the game (and yes, Sims could even ride them- and this was way before the Pets expansion pack added horses to The Sims 3 ), to one for The Sims 3 which added in a working ferris wheel. The way this is written makes it sound as though polygamy is the worst of these three.
…videos which showcase teen pregnancy, incest and even polygamy in The Sims 4.
