Roach shows how and why sexual arousal and orgasm can be so hard to achieve and what science is doing to make the bedroom a more satisfying place.

"To find out why people have sex, Curt Lively trawls a New Zealand lake for mud snails. Mayte Parada puts volunteers in an MRI scanner and turns on the porn. Andrea Ganna searches the genomes of half a million Brits. Almond-scented rats, Genghis Khan's family tree, Pornhub statistics-it's all in a day's work for sex researchers. This book introduces readers to sex researchers and explains the questions they are asking and the methods they are using...