From flea to whale there's one common driving force: the craving for sex. Indeed hamsters are so randy they often have sex seventy-five times a day. We may criticise pigs for their poor hygiene but when it comes to sex they sure take home the bacon, having orgasms that last a cock-boggling thirty minutes! However, for most men the urge to find a mate and have sex is delicately counter-balanced by the overwhelming desire to sit on the sofa watching telly while eating burgers and downing copious a