I've been wanting this since the Sims 1. The option to choose your Sims' sexual orientation (gay, bi, straight.) That way when you befriend someone you don't get wants to kiss/etc with one of your ...
I don't use free will. They do whatever I tell them to do so my stright sims are stright, gay ones are gay, and bi ones are bi. Also once you get them in a relationship they will follow your lead.