Actor and producer Tom Selleck would forever be cemented as one of the biggest sex symbols of the 1980s, thanks to a pleasant eight-year stint zipping around Oahu in a Ferrari in the top-rated series “Magnum, P.I.” (CBS, 1980-88). As often happens with long-running, star-making roles like “Magnum,” audiences were initially unwilling to accept him as anything other than an adventurous wise-cracking detective, but Selleck eventually nabbed big screen roles with films like “Three Men & A Baby” (1987), “Mr....