The Vulnerability of Being Pregnant

In high school, there's like a very specific amount of months that people will date and then break up. I think it has something to do with like Darwinism and mixing up of the genes. And I think women like to stay within a network of families so they can raise the children together. Whereas men like to leave because they need to find new genes to mix a match with. You're also supremely vulnerable when you're pregnant, I guess. It's like you're not going to be able to do a lot of things in the network.