'Hook up' culture - Laurie explores a new sexual culture on American campuses and asks if it has a British counterpart. Casual sex in higher education has a long history but Lisa Wade, Professor of Sociology at Occidental College Los Angeles, suggests a significant shift in the culture - one which benefits some students at the expense of others. They're joined by Zoe Strimpel, a researcher and historian from Sussex University, who has analysed the changing nature of dating.