As late as 2119, an alien race settled on Taurus II, when their homeworld began to die. They built, for themselves, an advanced civilization, including a temple and numerous other architectural wonders.
Unfortunately, these new inhabitants did not know that the planet drains humanoid energy. The women's bodies were able to develop a glandular secretion that enabled them to survive and to manipulate certain areas of the males' brains to influence their emotions, ultimately draining the men. This caused the men to weaken and eventually die. The females realized that, in order to survive, they must revitalize every 27 years, as they became eternal prisoners on Taurus II. They were neither capable of aging, dying or bearing children. They revitalized themselves by means of summoning male crew members of starships from as far as twenty light years away.
In 2269, the USS Enterprise was investigating several disappearances within range of Taurus II when they fell victim to the Taurean summons. After reaching an agreement with the Taureans, the crew of the Enterprise arranged for Starfleet to send a ship crewed by women. These women would transport the Taureans to a suitable planet where they could live out their lives as mortal women. (TAS: "The Lorelei Signal")