Let's talk about sex, baby. Let's talk about birds and bees. Let's talk about all the slime molds and the algae that can be, let's talk about sex. This week we are talking about the history of sex, where it came from, what it is, who has it, and why people are always trying to tell others they are not allowed to do it. We're getting down and dirty with Rachel Feltman and their new book, Been There, Done That: A Rousing History of Sex.