split off "Sexual Dimorphism" coda into separate post

I wanted to get it all in one package so I could just be done with the
Category War and walk away, but the second part is just too hard to
finish in a timely manner. (There are emotional and cognitive barriers
to convincingly making the AGP-truther case and the case against the
"rationalists"—and I have to get it right and be convincing for it to
have any chance of working.) But I'll feel a little better if I at
least get the first part out, which is a lot easier. (I'm just
exposing my own jizz-soaked laundry, rather than prosecuting anyone
else.)