I'm not saying this to be a smarta$$, but if all these women are having kids and barely any men are, who are impregnating all these women? Honest question. It just sounds strange to me.
It's a little more complicated than that, of course, and we're dealing with human averages, not just Western averages. Consider that there are over 30 million
more Chinese boys than girls coming of age in China now, thanks to the one-child policy and selective abortion back in the 80s and 90s. 30 million men who have virtually no hope of getting married, and not much hope of even getting laid by a nice Chinese girl without money changing hands. That's one country, one demographic, and one culture, but when you look at human statistics in aggregate, it tends to be about 80% females and 40% males. In other cultures it can be due to warfare (Africa, parts of Asia and the Middle East), culturally derived marriage patterns (Middle East, south Asia, Southeast Asia) or boys just giving up on the hope of ever having children because of the social pressures and the financial problems involved (Japan).
But in America, it still hovers around 40%, too. Consider for example the number of men in prison, not to mention the number of socially-retarded social nerds who have almost no sexual value. And now the ease of getting sex-for-hire and internet porn is going to decrease that, perhaps.