How do you figure polygamy happens more with younger folks - or are you conflating "polygamy" with "casually dating/having sex with more than one person"? And

How do you figure polygamy happens more with younger folks - or are you conflating "polygamy" with "casually dating/having sex with more than one person"? 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.