The ancient Greeks were very gay.
So much gay.
Like, all the gay.
Besides copious amounts of gender bending across the mythos, bisexuality took the cake. Zeus, Poseidon, Apollo, Hermes, Dionysus, and others were all known to take male lovers while Artemis, Leto, and Demeter had a history of taking female lovers.
So, here is the tale of Ganymede, the Greek god of homosexual love.
Ganymede was a human, from the city of Troy. His parentage is widely varied depending on the source material. He's got 6 different fathers and 2 different mothers. In The Iliad, his father is Tros, where the name Troy comes from, so we’ll go with that.
Ganymede was the most beautiful of mortals. As prince of Troy, it was customary to be raised by humble shepherds before his royalty was revealed to him. As he was tending the sheep on Mount Ida, outside Troy, Zeus saw him and was seized with affection (to put it lightly and drop the story to a friendly PG rating).
An eagle appeared and carried him off to Olympus. In some stories, the eagle was sent by Zeus. In others, it was Zeus himself transformed.
Tros grieved the loss of his son, so Zeus offered him a herd of immortal horses as compensation. Fair? Either way, Tros was comforted knowing his son would dwell immortally among the gods. It was, technically, the highest honor any human could be given.
Ganymede was given ambrosia, the special drink of the gods, which gives immortal life and eternal youth. He then became the official cupbearer for Olympus, replacing the goddess Hebe (daughter of Zeus and Hera, and goddess of brides and eternal youth) when she married Heracles.
Other sources say Zeus was totally fine booting his daughter out of her position, so there was a competition between Ganymede and Hebe to determine who was the better cupbearer. I don't know what that entails, but Ganymede won.
In honor of his victory, Zeus put him in the sky as the Aquarius constellation beside that of the great eagle.
On Olympus, Hera was driven to jealousy by Ganymede, as he was a constant pull of Zeus’ affection. Understandable, considering Zeus constantly abandoned her for other flings that should have landed him in jail.
The Greek goddesses really needed divorce lawyers.
Anyway, Ganymede was the only lover that Zeus offered immortality to, leaving some Greek authors to write that Zeus held genuine love and affection for Ganymede.
Debatable. Consent wasn't much of a thing and no one asked Ganymede what he thought. But, he did become the patron deity of homosexuality. (Although sometimes, Eros also carries that title.)
Additionally, Ganymede is the name of the largest moon of Jupiter. Most of which are named after Zeus' "lovers."