Basically, if you want a good marriage and family, you better actually do something that produces that result — and from a young age, like 16. If you spent all your time and energy doing everything that is contrary to that result, it might not happen.
Unfortunately, women can’t figure this out for themselves, until after the age of 30, when it is too late for most of them. That is why older women like Suzanne Venker have to explain it.