I asked a ton of monogamous people how long they'd been in their relationship, and a ton of poly people how long they'd been in their primary relationship. The average relationship length was almost identical.
I didn't ask about more than one of the partners for poly people (due to logistical limitations of question design) so it's possible those were shorter; however this indicates if you're the "main" squeeze of a poly person, there's about as much commitment as there is for monogs
This is important. Suppose male value is a constant, as is a female demand for that value. Female value is constant, too.
There's a relative level of "value" a main squeeze male has to match to stay main.
It doesn't indicate that at all. Is length of a relationship a good proxy for intensity?
When you only look for marriage, you'll likely date a few people briefly, find they aren't right, then completely commit to someone that is. Average length is low, but commitment high.