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 think it's too much trouble and contraversey for something that's not really much of a problem in the first place. I have nothing against any kind sexual orientation, but I think there are a lot of people who do and making this a feature in the game would probably only cause more problems than solve any.