The three major reasons that I think this is happening, have all been touched on:
1 - Quantifiable and medically proved fact that men's sperm and testosterone counts are lowering, due to some as yet undetermined cause.
2 - Cheap, non stop and with every conceivable kink imaginable: porn and electric, digital and robot sex.
3 - Woemen have gone utterly, totally, off the reservation batshit insane. They have made it their mission to be as unattractive, unappealing, unsexy, difficult, dangerous, irrational, hateful, illogical, petty, small, and spiteful as possible. Since they all want to be men, I can only assume that is how they view men. There is no upside for a young man to commit to one of these harridans for the long term or even for a short term "hook up". See number 2 above.