Scientist and broadcaster Aarathi Prasad has a PhD in mammalian cell cycle biology from Imperial College, London, and in her new book Like A Virgin: How Science is Redesigning the Rules of Sex (Oneworld, 2012), she tackles the notion of reproduction without the sex act. Dr Prasad is a single parent, with a young daughter she had with a white father. Excerpts from an interview with Saptarshi Ray: