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Parenting Rewires the Male Brain
sciencehabit writes: "Cultures around the world have long assumed that women are hardwired to be mothers. But a new study (abstract) suggests that caring for children awakens a parenting network in the brain—even turning on some of the same circuits in men as it does in women. The research implies that the neural underpinnings of the so-called maternal instinct aren't unique to women, or activated solely by hormones, but can be developed by anyone who chooses to be a parent."
Just remember time discounting and the generally shoddy statistical intuitions of humans: While I don't doubt that your assessment is correct (I don't have the data, you do, and in any case I'm willing to agree for sake of argument), you have the sex first, sometimes even without consequence(I forget the exact stats; but some combination of failure to fertilize and early-stage spontaneous abortion keep even unprotected sex during fertile periods from leading to recognizable pregnancy 100% of the time, and the odds fall further in lower fertility periods) and then have to deal with kiddo later.
Given that humans tend to markedly discount future costs, and do basically every horrible thing imaginable to statistical judgements, it may well be simultaneously true that your assessment of overall cost over time is correct and laziness(in combination with poor assessment of risk-discounted future costs, and/or short term lapses in judgement caused by the relative attractiveness of futzing with a condom or hot animalistic fucking) leads people to keep having kids where a less-lazy approach would more rigorously apply preventative measures.