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Orion pheromones

Pheromones produced by Orion females

A pheromone was a chemical secreted by a lifeform that had an effect on another lifeform.

Locator bombs worked by homing in on an individual's pheromones. (DS9: "The Nagus")

Some Orion females secreted a highly potent pheromone that accelerated the metabolisms of males of many species, raising adrenaline production to dangerous levels. It caused aggression and a form of delusion that made the males susceptible to suggestion. The pheromone caused headaches in Human females and disrupted the sleep cycle of Denobulan males; Vulcans, however, were immune. The pheromone's effects were cumulative; the longer one was exposed, the more pronounced the results. In 2154, Doctor Phlox of the Enterprise NX-01 theorized that the pheromone acted as a defense mechanism against competition. (ENT: "Bound") Not all Orion females chose to secrete these pheromones. (LD: "We'll Always Have Tom Paris") On Orion, there were many establishments where males could indulge themselves in the pheromones of female Orions. Orion males who were addicted to pheromones were occasionally referred to as "moneheads." (LD: "Something Borrowed, Something Green")

Denobulan females emitted powerful pheromones during their mating season. Male Denobulans often became combative during this time, and mating could require medical supervision. (ENT: "Dear Doctor", "A Night in Sickbay", "Bounty")

During the finiis'ral, the final stage of a Kriosian empathic metamorph's bonding, they produce elevated levels of what Humans would call pheromones. (TNG: "The Perfect Mate")

In 2370, Captain Picard used pheromones from Deanna Troi to lure Worf away from sickbay while they all suffered from Barclay's Protomorphosis Syndrome. (TNG: "Genesis")

Ramurans produced pheromones that prevented the formation of long-term memory engrams in other species they interacted with. (VOY: "Unforgettable")

In 2375, One, an advanced Borg drone with 29th-century technology, detected an elevated pheromonal response in a USS Voyager crewmember, indicating that she was afraid of him. (VOY: "Drone")

Queen Arachnia pheromone vial

Queen Arachnia's pheromone vial

In The Adventures of Captain Proton holoprogram, the character of Queen Arachnia had, in her possession, a small vial of her pheromones, which she could use to seduce and control others. Kathryn Janeway, as Arachnia in 2375, used these pheromones against the character of Lonzak. (VOY: "Bride of Chaotica!")

In the stage directions from the first draft script of ENT: "Rogue Planet", Captain Archer likened a form of chemical signature emitted by wraiths, when they were afraid, to a pheromone and, shortly afterwards, called the chemical actually a pheromone. However, these two references weren't included in the final draft of the teleplay (nor in the final version of the episode), in which Archer's likeness was omitted altogether whereas, in the second reference, the term "pheromone" was replaced with the word "chemical".

In the novelization of Star Trek: The Motion Picture, pheromones were the reason for the Deltans being viewed as sexually attractive by other species.

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