Explain: If two women are lesbians in a relationship, and one decides to become a male, is the one who becomes a male now straight? And the lesbian who stayed female, now become straight?
Parker and Stone, the South Park guys, are way ahead of you on parodying that sort of craziness.
School teacher Mr. Garrison, who is gay, gets a sex change. So he’s now Mrs. Garrison - who then becomes a lesbian.