The mung bean munchers have finally found their mojo. While vegans have always been hailed for their discipline and principles, sex appeal has never really been their preserve. Forgoing animal products has been written off as too worthy, too joyless, too Guardian-reader with bad shoes and a smug sense of superiority. And salad seems limp next to the suggestive sausage, the dribbling-down-the-chin burger or the irresistible scent of frying bacon. Carnal thoughts were reserved for us carnivores.