This is precisely as reductionist as the author’s claim about monogamy.

There are a thousand reasons that someone may be drawn to either lifestyle, a thousand more reasons why someone might find themselves shifting between them, and still a thousand more reasons why someone might be situationalist and not identify with any prevailing lifestyle for themselves at all.

Depthful discussions about different ways of living can be interesting and enlightening, but making reductionist claims about the “other” doesn’t deliver on that.