I don't think you can because I have been trying with a lot of different girls.
you could on the first sims. You just have to make them kiss a lot!!! I mean, like 70 times in a row, literally. Try that and tell me if it works.
No, you can't. I have tried forever. Plus I've gone the home websites for the sims 2 and still haven't found a way.
You can't sorry, but you can try going to The Sims 2.com. I already did, but I may hvae been looking in the wrong place.
You should get married and get into a double bed and get them in. It should say try for a baby, but it doesn't work. I tried and failed.