Partially related to having a family becoming more risky for men. If you are not protected in case of a separation, you are less likely to want to commit to a family. If there is no family, there is less motivation to earn more.
I find that a pretty suspect statement, and I'm not sure I've ever encountered any man who's decided to avoid starting a family for that reason.
Up to and including paying child support for someone who isn't even yours. Or paying child support for a child resulting from you being raped.
And there's no way around it currently. Currently, even if both parties agree, there's no way for them to actually form a binding agreement. It's gotten to the point where prenuptials are essentially useless. They are far too easily thrown out.
However, I would not tell you as such in person unless specifically asked, and possibly not even then. It's a good way to get ostracized.
Though there's also a moral component for me, but that is another matter.