Well, a lot depends on your source of food and population. Of course the more people you can get at the table the better. (duh), but the people you have, the more food you will need. You should have another 20 years with your female, so don't get to scared just yet, but like you said, you need to get another girl for "safty". What levels of harvesting and building do you have? What is your population?
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The VI