Over last week, "Darwinist" X floated some commentary on the Pelvic Floor, which women sometimes nickname "The Undercarriage". Being bipedal offers some advantages, for bears anyway: a higher periscope, freeing the hands to fight or pick fruit, and looking larger to scare off scavengers. Last year Marcos García-Diez, Philip Van Kerrebroeck, and Javier C. Angulo taught us that obligate bipedalism - such as kangaroos, theropods, and we humies enjoy - has tradeoffs.
Consider this a follow-up to Elaine Morgan's work. I recall haemorrhoids flaring in Scars of Evolution.
We got tight strong buttocks, and that's bad for birthing babies. Going the full Mix-A-Lot removes the advantages which help us men maximise our runs and jumps. I suppose keeping births to single babies or twins might have helped.
The paper points out that the squirrel-monkey has taken a parallel path.
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