My main interests are male-male-female threesomes with full-on bisexuality, less anal play (it just strikes me as icky and dangerous).
I also get quite titillated by stories of Mother-Son and Brother-Daughter incest, even though I don't find either my mother or my sister particularly exciting...
My philosophy with my stories is to make them short and smutty. Any character development, backstory, or plot should be subordinated to the sex (not in literature, but who comes here for literature).