How often do people have sex?

Available for over a year

Magazine articles and advice columns are commonly littered with spurious statistics about how much sex we’re having. So how much do we really know – and what are the difficulties of collecting information about such an intimate part of our lives? Doctor Marina Adshade from the Vancouver School of Economics, who specialises in the economics of sex and love, answers questions posed by a curious More or Less listener in Japan. Presenter: Tim Harford Producer: Jon Bithrey (Photo: Happy couple looking into each other's eyes. Credit: Getty images)