It was a good wrap up on evolutionary aspects of human and other animals' sexuality. We are the odd ones among mammals and almost all animals when it comes to sexual traits, from the way children are born and cared for to burden of responsibility, bonding and marriage patterns and female menopause!
For quick take away: men can lactate and share the chore of feeding the children.
This was cool, not any deeper than books on cognitive biases and error (e.g Thinking Fast & Slow), but full of good, tangible examples.
In essence knowing you are biased isn't often sufficient, you need to counter it per case, and this book covers some well known examples of such biases and counter measures.