Slash =! sex

Slash is a genre; sex is an act. "Pre-slash" is now employed to mean "before the characters have sex."

This is incorrect.

George Carlin had a routine about "pre":

"'Preheat the oven to 350 degrees'." Bullshit. The oven is either heated, or it is unheated. "'Heat the oven to 350 degrees'." Perfectly understandable. At the airport, they ask first-class passengers and passengers who need assistance to 'pre-board'. What does that mean? You get on *before you get on*? Pre is a meaningless fucking term."

Either a story is in the slash genre, or it isn't. It doesn't have to have sex in it to be in the slash genre.

This annoys me.

As you were.