Free will
Free Will enables the Sims to move without your direction. They can move and do certain actions without you telling them to, if you turn it on in the menu. Most of these actions are in connection with their needs, they do others just for fun.
Free Will is set for each lot and can be set from the "Game Options" menu. When a family moves into a new lot, they will have Free Will on.
Certain things like WooHoo will not be done by Sims with this turned on. You will need to direct them.
Some things that Sims do in Free Will won't occur when Sims are in a very bad mood.