The title was to be released on February 20, 2009 according to the official The Sims 3 website, but was delayed worldwide to June 2, 2009.
Electronic Arts cites the reason for the delay was to "create awareness for The Sims 3". It shows something towards a continuous, panning neighborhood, diagonal placings for objects, better lighting systems, and the ability to change shoes in the CAS, an ability previously limited to only console versions of The Sims.
It's a small mechanic, but it can give your single Sims a romantic target in case you have no other plans.
This feature is the main theme of The Sims: Hot Date and The Sims 2: Nightlife.
It was also reintroduced to The Sims 3 via Patch 22 and the Generations expansion pack, and was included in The Sims 4 base game.
Such things like personality, Create-A-Sim, and build mode have been expanded.
The Sims 3 also is the first game to feature an open-world concept: players are no longer limited to single lots; they are able to explore the world in between and travel to lots without loading screens.
Other Sims don't respect your vows, so you may get a lot of calls asking your Sims on a date even if they're married.
Dating is a romantic activity where two Sims spend their time doing romantic things together.
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A new feature of The Sims 3 is attraction, which is available with the latest patch regardless of whether you have Seasons installed.
This will invite children to your Sim's home and they'll be paid for watching them.