Oh, there isn't! I hadn't even thought to make one, honestly. xD I suppose they can just go under the hetero, yaoi, or yuri pairing folders, depending on which category they fall under. Also, I know there are still some issues with some people being able to submit to the right folders, so if that's a problem, just submit them to the featured folder and don't worry about it, I'll sort them out afterwards! c: