Dr Brooke Magnanti
She is also known by her pen name Belle de Jour. Having worked as a call girl to fund her studies, she wrote a series of novels including Diary of a London Call Girl, which were later adapted into the TV series Secret Diary of a Call Girl.
Is there any truth to the epidemic of sex addiction? Are our children really getting sexualised younger? Are men the only ones who like porn? Brooke Magnanti looks at all these questions and more - and proves that perhaps we've all been taking the answers for granted.