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