Semen during pregnancy

Chris Masterjohn pointed out that my last semen post pointed towards a biological bolster for monogamy in this modern age. Here is another. I'm sorry but this post is less fun than the last one about semen, but I promise another one that is less alarming in the future, though I have a post in the queue on birth control that's rather unfun. 

Postpartum Depression & Goop

Is there an evolutionary explanation for something like Postpartum Depression, which seems, from the outset, so maladaptive? Ancient Bodies Modern Lives discusses cultural and social factors, but also posits some evolutionary explanations. One is that it would allow paleolithic women to "cut their losses" and abandon a baby whose care would affect her survival.

Real Food For Mother and Baby