kind of irresponsible (and selfish) though as the planet is already overpopulated. what if everyone did this?
Well, if everyone left on its own for a crocodile infested hostile wilderness, hunted barehanded, and had sex with the occasional passerby, I could assure you there would be no overpopulation problem. In the wilderness it makes sens to have plenty of baby-making sex, since a part of these children will not survive long enough to reproduce: because of predators, lack of resources, and other threats. The birth/death ratio is usually balanced, so there is just enough individuals to reproduce and keep the population at a steady viable number. Of course the more food, the safer the environment etc, the greater the population, and vice versa.
In our modern world, our super-safe, super-plentiful world, it does not make as much sens to conceive so many babies, since the chances our children will survive to adult age are much much greater. So you can either populate the world to the point where there's an actual food shortage, or take a global decision to restrict the number of children per women to 2-3 (probably enough for the world population to regenerate), and maybe allow people to make more children in times following major crisis, such as natural disasters and wars. The matter might be more complex than that, but that's how I see things atm.
