Gay Parents and gender specific terms
I read mostly m/m slash, so I don't know if ficcers do this with lesbian couples, but why the hell do fanbrats feel the need to have a child call one of their two male parents "mommy" or any variant thereof? I can understand this in certain situations, such as if one of the men does indeed identify as a woman, then he'd likely tell the kid he's "mommy."

There's also a One Piece fic where Zoro and Sanji end up attached to a kid and Zoro tells the kid that Sanji is "mommy" because he's a bastard like that.

But beyond that a a select few other situations, it makes no sense, especially when, canonically speaking, neither of the men in question are what one would call "effeminate."

I understand the need for a distinction, but there are better ways of doing that, like calling one father "pops" and the other "dad" or something of that ilk.

Or, if the kid is in his obnoxious teenage years, "sperm donor" and "thing attached to sperm donor."

SD and TASD for short.