Elasian
Elasians were a humanoid species, native to the planet Elas of the Tellun system.
Federation scientists described Elasian males as "vicious and arrogant" in early reports. Females had the ability to produce Elasian tears, a biochemical compound transmittable to males (including Human men) upon contact. The affected man became romantically infatuated and somewhat enthralled to the woman who infected them. Over centuries, men of Elas tried to overcome the tears' power, without success.
In the 23rd century, the Elasian government included a Council of Nobles, and great homage and deference was paid to their royal Dohlman. Their technological level was pre-warp; with nuclear powered weapons and starships. Some Elasians wore a light and translucent body armor.
Elasians considered themselves a warrior people, and held little regard for the relatively gentle culture of their neighbors, the Troyians of Troyius. By 2268, after a long period of war with the Troyians, the two civilizations recognized the possibility of their mutual destruction. Some hope for peaceful coexistence began when elements of both governments supported an arranged marriage between Elaan, the Dohlman of Elas, and the ruler of Troyius. (TOS: "Elaan of Troyius")