That IS a great video.
The 80/20 rule is now confirmed by multiple data sets, thanks to online dating and “dating” apps (the latter matches aren’t really dates, we used to call them something else).
80% of the women who use these services consistently find only 20% of the men acceptable. And, since the currency of the mating market has switched (with exceptions, etc, blah, blah, blah) from potential as a father or mother of one’s children to skill in the sack, the numbers predict that each of the top 20% of men will have 4 simultaneous female sex partners.
Now, it doesn’t work out like that, a) because 4 involves a lot of heavy lifting and men have other things to do, and b) Of the 80% XX people who find 20% of the XY people acceptable, not all of them are cool with being in a harem.
But - enough of them are cool with it to render the fraction of the 80% of “unacceptable” men unpartnered on a permanent or semi-permanent basis pretty large, and it makes some of them crazy.
“There’s someone for everyone” was a nice story, and when it was mostly true, was a factor in social peace. Now that it is glaringly, obviously not true, we have a serious problem.
Back when people lived all their lives more or less in the same town, the pickings were slim, you had to find somebody in your teens, or else you would be stuck.
And no woman wanted to be referred to as an “old maid” or “spinster”.