It's interesting that every comment here is now on board with what groups like "incels" and "MRAs" been saying for years. These groups are often called "hate groups", but now more and more stats are coming out it seems more people agree with them (I have always agreed with them, by the way).

Nobody has yet mentioned another potentially large driver, though. That is the abundance of Internet porn that is available from a young age now. There are men who have grown up being able to watch any kind of porn they can imagine. Having sex is a lot of effort and not really worth it if you're already overwhelmed with all the women you could want from the comfort of your own bedroom.