Mismatch - dance 'til sunrise

Note that the ureters, which carry urine from the kidneys to the bladder, pass through the gaps between the three tubes. In placental mammals, like us, the ureters develop in a different way, and don’t go through the reproductive system. As we develop, the precursors to the reproductive tubes eventually fuse into a single vagina. In marsupials, this can’t happen.

BURNETT: Well, I think the classic example is like someone claiming they caught a fish this big, holding their arms out. And oh, the obvious joke is that they didn't really. That's actually just exaggeration. But all of you will think that's just someone lying to try and look better.

Writing for Springer’s journal of Evolutionary Psychological Science, the authors – who are based at the Ulster Institute for Social Research and Rotterdam University respectively – explained their model is based on the ideas of evolutionary psychologist Satoshi Kanazawa.