No, most of the time their conclusions are pretty damn water tight - which is a huge part of why this book is so satisfying. The biological & anthropological indicators that we evolved with multiple male/female sexual partners are VAST. It's not one or two maybes, it's HUGE INTRICATE physiological structures of attack and counter attack at the biological level that ONLY make sense if multiple inseminations happened back to back (for example). And what makes the authors (and the reader) headdesk and laugh so often, is how frequently the researchers write their papers, faithfully take down all the evidence....and then through some really impressive magical thinking, conclude, "So hominids have been monogamous throughout their evolution - just like the good lord instructs!"

The authors do get delightfully snarky about it :D