How about an entire gay race, the J'naii:
http://memory-alpha.org/en/wiki/J'naii
The J’naii weren’t gay, they were genderless.
I’ve always thought it would have been cool to encounter a truly “gay race.” Imagine the Enterprise encounters a world where the the people are gay. The reproduce in laboratories. The family unit, which is a bedrock of their society, consists either of one or more boys being raised by two fathers who teach the boys how to be men, or one or more girls being raised by two mothers who teach the girls how to be women.
But here’s the deal: Only 90% of their people are really gay. 10% are straight. The straights are denounced by the dominant religion on the planet, which teaches that heterosexual sex is animalistic, vile, and sinful, while homosexual bonding is spiritual and holy. The straights are pressured by the majority to “change their lifestyles,” give up their sinful ways, and live as gays. Straights are scorned and often targeted for violence. They do not get many of the basic legal rights that gays take for granted. “Reparative therapy” is offered to “cure” them. And so on.
Just to give viewers a brief opportunity to imagine what it would be like being on the other side, you know?