When you do get the . . .erm. . .urge, it's usually just your reproductive hormones going "DO IT!!! WE NEED TO CONTINUE THE HUMAN RACE EVEN THOUGH WE'VE GROWN OUT OF THE ERA THAT REQUIRED SHITTONS OF BIRTH TO HAVE A SURVIVING CHILD! NO REGRETS!" And then everything goes to shit.
If you're going to get all biologically deterministic about it, you might as well say that the entirety of human behavior and physiology is the result of natural selection mostly taking place nowhere even close to the modern era to begin with, though. And then everything goes to shit!
None of this matters anyway. Evolution means that current extant adaptations are always those that were useful to
previous generations.
On a related note, what
would you say
is "required", now that we're talking in a more general sense. I believe that we should just go with these things because in the grand scheme
nothing is required. Ultimately the fact that we no longer "
need" to have lots of children, or "
need" to consume any food that becones available, in order to continue the human race means
nothing because we never
needed to to continue the human race in the first place. Its just something we do and just as much as these other things that have been mentioned is not "Needed" but is merely a side-effect of the unthinking process of evolution. If we limited ourselves to things that were truly necessary we would fall inert until we die.
If you meant "adaptationally required", then it is still unnecessary to do something about it. Adaptation will take care of itself, as it did for billions of years before humanity evolved.