The Lorelei Signal

A planet populated by women who regain their strength by sapping the energy of men. They use a siren call that seems irresistible. The males, who run things on the Enterprise, end up on this planet. All the women are beautiful and sultry. It turns out as they take on the men, the guys lose their essence. It then causes them to age, so Leonard, Jim, and Spock are showing some wrinkles and spend their days sleeping in order to return with some strength. This is a showplace for the women on the bridge who need to come to the rescue. A dumb premise and a dumb episode.