This is a very rough idea, but I thought I'd throw it out there. There are members who specifically want a challenge that involves romance, having babies, and raising a family, plus adding some of the World Adventures excitement. The concern has been that deliberately seeking out multiple unwed fathers would feel less than moral. I thought perhaps the rules could include having the Surrounded by Family Lifetime Wish and requiring that the non-playable parents have to come from the three foreign locations. For example, you play a female Sim and she goes to China, meets and marries a local, and gets pregnant. She then has to break up with the local and find another husband in Egypt. Again marry and get pregnant. And so on until the Lifetime Wish is achieved. Ultimately, your Sim would have at least five children and they would be of mixed heritage from China, Egypt, and France. The scoring could be done a number of ways, but I haven't gotten that far yet.
If anyone has some ideas about how this could work, I'd love to hear them!