To Get A Man Or Woman Pregnant -
1)(Cheat Window - Alt+Ctrl+C) Get The Cheat Window Up And Type -
boolProp testingCheatsEnabled true
2)Shift-Click your sim and click more then spawn and click tombstone of L&D.
3)Click the tombstone that appered then click the sim you want pregnant(make sure its an adult!) and click the tombstone then more then make me pregnant with... and click the person you want to be the mother or father or make me alien pregnant.
4)To speed up the pregnancy, click the tombstone and click more then speed up my pregnancy.
5)To make him or her have twins get the cheat window up and type - forceTwins
Happy pregnancy!