You know, I don't think I've ever warned for slash. I just assume that it's TW, there must be slash, and everyone must know that.

As far as pairings, while I love me some Jack/Ianto, and really don't like Jack/Gwen or Ianto/Gwen, I will read other pairings. And even write them, too, apparently. But in the end, it always comes back to Jack/Ianto for me.