We're busy all the time, and a lot of that time is with things that make us really fucking angry or stressed: work, traffic, the infinite social obligations that are probably bullshit but we feel we need to do to survive (business networking, our fucking gym memberships, that friend who always wants to do something stupid), and for those not single, don't even get me started on all the things we're pressured to do for our kids.
We get home and we're angry and have 10 minutes before it's time to go to bed and repeat it all, and we choose not to take out our frustrations on our partner and ditract ourselves with scrolling or tv or something. Is it really a surprise that we don't fuck as much? It's not that we don't want to, it's just that in the time-slot dedicated to sexy time, we're probably not feeling like sexy time.
I don't think our society is worth saving enough to figure out how to unwind all of this, although the obvious solution is so obvious.