The fact that the answerer quotes John McIlhenny, noted Christian abstinence-only prominent, tells me more about that answerer than the questioner.
In my experience, the real answer is that The Pill means that women have more choice now and don't have to cleave themselves to the first man who colonizes them, and now that it's baked into society, women aren't going to put up with men who can't provide the social interaction reward that all people want. In my parents day, you just had to tough it out because you had kids (and you were probably terrible at it, lookin'at you mom and dad) but these days people can grow into finctional adults first, which might not happen until their late 30's.
In my experience, the real answer is that The Pill means that women have more choice now and don't have to cleave themselves to the first man who colonizes them, and now that it's baked into society, women aren't going to put up with men who can't provide the social interaction reward that all people want. In my parents day, you just had to tough it out because you had kids (and you were probably terrible at it, lookin'at you mom and dad) but these days people can grow into finctional adults first, which might not happen until their late 30's.