“Radio Andy,” the 71-year-old “Miami Vice” star said that his prowess in the boudoir has improved over the years, and that he’s gotten sparkling reviews from his ex-lovers, who include the likes of Melanie Griffith and Cybil Shepherd, the Daily Mail reported.When asked by host Andy Cohen, 53, if his sex drive remains as active as in his youth, Johnson replied with a straightforward “yes.”The Golden Globe winner insisted that not only did his appetite for nookie not wane but that he “never”