“One of the most original books I've read in years, Sex at Dawn manages to be both enormously erudite and wildly entertaining -- even, frequently, hilarious. Ryan and Jethá slip effortlessly across millions of years, from the savanna of prehistoric Africa to the contemporary bedroom, presenting cutting-edge research with clarity and wit. A must-read for anyone interested in where our sexual impulses come from, Sex at Dawn helps explain why modern men and women behave as strangely as we often do.”
— Tony Perrottet, author of Napoleon's Privates: 2500 Years of History Unzipped.