Anna Richardson and sexual health expert Dr Radha Modgil are at Raines School in East London to give students ground-breaking lessons in sex education. In live anatomy lessons featuring elderly male and female models, the students learn how both the body and sex changes as we age. The students also learn the truth about vaginal health and are encouraged to overcome the ultimate in embarrassment, talking about sex with your parents. Anna also meets two plus-size women who claim to enjoy loads of great sex. They talk us through their favourite positions and tell us why being big is a help, not a hindrance, when it comes having a healthy sex life. Plus the show meets Ed Evans whose obesity resulted at one point in 'buried penis syndrome', with him unable to have penetrative sex.