Apparently you haven't witnessed the manga Nana to Kaoru.
Its a good general starting point on understanding slave and master relationships while keeping it vanilla.
Here have a look:
http://www.mangafox.com/manga/nana_to_kaoru/
In any event I skim the old man. NTR is fine for me only to a certain degree.
And BDSM is interesting to me in alot of aspects as long as it doesn't cross that guro line.
BTW: redo that pole. Its really confusing when you vote one subject while you offered 3 topics that have no relation whatsoever haha (besides the obvious).