Ignores the apparent fact that polygamy and rapid serial monogamy are very common in under-25's but happens a lot less with married people. So young people have a lot more mates available by sharing.
And isn't "rapid serial monogamy" just dating one person at a time? And this doesn't seem so much different than 20 years ago, though it might look different than earlier times when parents had more direct control over who their daughter dated/married. (and of course folks date most folks for a short time: it takes time to get to know someone - hence 6-12 month relationships happening quite often.
Personally though ... hard pass.