Margo Zimmerman is gay, but she didn’t know until now. An overachiever at heart, Margo …
Content warning very minor spoiler; tangential to main plot
And I say, more clearly, more resolutely, to my parents, "I'm gay. I'm just... I don't know what else to say. I'm gay."
There is total silence in the room.
Then my mom says, "Oh, thank G-d."
I blink. "What?"
My dad sighs, like he's relieved. "Margo. Sweetheart. You have terrible taste in boys."
— Margo Zimmerman Gets the Girl by Brianna R. Shrum, Sara Waxelbaum
Since it isn't entirely clear from the text, that's "gay" as in "lesbian" as in not going to be dating boys any more.