Tall, dazzling and with an unforgettable moustache, Tom Selleck is known to millions as the private detective Thomas Magnum from the television series that made his name famous. Celebrated in the ’80s as one of the most attractive men in the world, he played the tanned, laid-back star clad in bright Hawaiian shirts, racing around solving crimes in a red Ferrari. We now know he never intended to become an actor, the Hollywood star tells us in his autobiography “You Never Know,” released in early May. “I’d never had the slightest interest in acting. Ever,” Selleck writes in the book. In an inter…