No, it's not. You'll find the terms "lemon" and "lime" in slash fiction. Almost every archive out there that caters to slash use those terms, as well as "yaoi" and "hentai", geared more towards the anime fics. There's also chan, which you may know. If not, that's fic with underaged characters.

I wish I'd seen this earlier, it would have been funny jumping in going, "Hey, we only use those terms for non-canon slash!fic!" lol