Article: If you need an alien pregnancy quickly or are simply impatient, consider forcing the abduction to occur. There are two ways of doing this, depending on what expansions you have.   If you have FreeTime: Get the "Summon Aliens" lifetime reward if your Sim is a Knowledge Sim. You should be able to have your Sim summon aliens through the telescope, which greatly increases the chance of abduction.  If you haven't installed Seasons or any later expansions: Enter boolprop testingcheatsenabled true, then shift-click the telescope and hit DEBUG - Get Abducted. This will not work if you're running Seasons or later.
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Consider forcing abduction.