Make sure you downloaded the latest version: Play the game making all three girls happy, and Marcus' lady happy:
Mrs. Turner: be understandable, watch romantic movie, kiss her, say yes when she asks about sexual thoughts of others.
Tracy: help her, keep cool, tease her, follow Tracy and Nora, visit her dream, tell her the truth.
Alice: Tell her to love someone, walk away during her shower, go to ice cream store with her.
Marcus' Mom: leave, don't use spell
Near the ending right before you tear the dude in half, select options and click on 'alt. ending.' This should enable the ending where they're all pregnant. If you don't choose alt. ending, you basically just play with all three of them at the same time.