The National Surveys of Sexual Attitudes and Lifestyles is a deep look into the sex lives of us brits - and has been running now for 30 years, giving us some longitudinal data about the way in which those sex lives have changed. The latest paper to be published, based on that data, looks at the frequency of sex - how often different groups are having sex on a weekly basis, and has reported a drop in that frequency for some groups.

Joining us to talk about the research, and why we're having less sex, is Kaye Wellings, Professor of Sexual and Reproductive Health at the London School of Hygiene and Tropical Medicine.

Read the full open access research: