Zoologist Jules Howard gives a spirited and enlightening talk on the glamorous world of animal vaginas, revealing how female animals are not coy, as Darwin believed, but selective. We discover that pandas aren’t bad a sex (just bad a zoos) and that the female mallard can change the shape of hers so the ‘right key fits the lock’. Back in the studio, our inimitable hosts regale the audience with a rich range of anecdotes drawn from this episode’s topic.