Robert Webb has been a male for his whole life. As such, he has been a boy in a world of fighting, pointless posturing, and the insistence that he stop crying. As an adult man, he has enjoyed better luck, both in his work as the Webb half of Mitchell & Webb as an acclaimed actor and comedian, and as author of the part memoir, part call to arms, How Not to Be a Boy. He talks to Sarfraz Manzoor.