An aphrodisiac was an object or substance that heightened sexual desire and awareness, though this effect could be imaginary.
According to Phlox in 2151, some species used triglobulin, produced within the bodies of the sentient Axanar, as an aphrodisiac. Pointedly, Jonathan Archer told Phlox that while Humans had collected aphrodisiacs from animals, they had not harvested them from people. (ENT: "Fight or Flight")
In the same year, while possessing the body of Kes, Tieran offered her power if she would join him and stop mentally resisting his possession, stating "I assure you, it is the finest aphrodisiac there is." Kes, however, was not persuaded. (VOY: "Warlord")
On board the Silver Blood USS Voyager in 2375, Neelix offered Tom Paris for his honeymoon with B'Elanna Torres a holoprogram of a mountain resort on the fifth moon of Cytrax, which had crickets with songs that were reputed to be an "auditory aphrodisiac". Tom turned it down, claiming that he and B'Elanna did not need aphrodisiacs. (VOY: "Course: Oblivion")