"I wonder what the societal implications are for having a majority of young men be very undesirable and a majority of women start on top of the world at 18 and steadily fall down from there and have to settle. It doesn't seem to be good for either gender."

I dont think we have seen the full impact of this yet. Online dating has been a major catalyst and made things alot worse. I think we are still 10-15, maybe 20 years off before we see people growing older and the toll this type of sexual marketplace takes on their relationships.