I thought that's where "slash" got it's moniker: character "/" character. If it's two males, voilá, you've got your warning. I'm relatively new (less than two years) to online fanfic, but there are some generally accepted formats that I've noticed. Comma gets you no pairing, slash gets you smut (or at least romance). Although as new people come into it, I guess formatting is bound to pushed around a bit.

And I checked "I'll read anything at least once" but what I really meant was "depends on the author". Damn trigger happy clicky-finger!