If you are talking about the Sims 2 on the computer, that should never happen.
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You can get your sim pregnant in Sims 2 Apartment Life and Sims 2 Double Deluxe.
There is no way to get married in the sims 2 for the PSP.
No, Sims can not kill each other only the player (you) can kill Sims.
I've had to do this many times ...you need to have those to sims fight fight fight . and eventually , they will wanna break up . you will know when you click on your sims yu clickclick on your simsclick on irritateargueeventually... this will happen...click on your simsclick on FIGHTclick on BREAK UPthen once yu click on that , your sims will break up . one of your sims will move out of the house . but then yu can always play them because they are in the bin with the families that have no home yet(=
You can not make a Sim anorexic.