Maybe. What detriment are you thinking of?
I'm just observing that since monogamy restricts us to this 1:1 gender ratio, and since in some cases one of those 1s is taken off the table (either literally or if not literally, maybe effectively due to low quality) this drastically restricts society's ability to meet a basic human need one a wide scale. To make matters worse, situations like China's gender imbalance add to the challenges that already exist when the gender split is close to 50-50. Wouldn't you agree that these kinds of challenges might be reduced if a many-to-one structure was just as socially acceptable as a one-to-one structure? Could the pigeonhole principle have something to do with the demand for sex trafficking? If this is an unreasonable line of thought, I'd love to understand why.