Dr. Christopher Ryan (@ChrisRyanPhD), author of the New York Times bestseller Sex At Dawn, joins Matt, Andy and comedian guests Caitlin Gill (@robotcaitlin) and Lisa Best (@lisabestcomedy) for a live installment of Probably Science recorded at the 2015 Bridgetown Comedy Festival (@bridgetown) in Portland, Oregon to talk about the prehistoric roots of modern sexuality, the devastating impact of agriculture on our species, why humans and bonobos are so horny and whether it's actually in our nature to be monogamous. Oh, and this was recorded on Mother's Day. With Andy's parents in the audience.