Yeah, I had that problem just a while ago. I only had one woman and all she would do is give birth to boys. She finally had a girl right before she turned 50. So the village ended up with some really skewed demographics... there were 6 old men, Lapita (the woman, who was 50), a gazillion teenage boys, and a 2-year-old girl. (Lapita was the youngest child in the original group). So, after the old men all died off, Lapita was the matriarch running the whole tribe for quite a few years.

This also led to the side effect that the entire village is blond(e). Lapita herself is blonde, and it seems that she only made out with the blond guys. There are times when I fear for the genetic instability of that tribe...