I think this relies on an overestimation of the planning and foresight that goes into most pregnancies. About half of US pregnancies are unplanned, and it certa

I think this relies on an overestimation of the planning and foresight that goes into most pregnancies. About half of US pregnancies are unplanned, and it certainly seems like there are large segments of the population for whom even relatively short-term risks, like the propensity of the father to cheat--or never be involved at all--are basically ignored when choosing a mate.