Hmm...yes, I think it's possible. To a lot of people D/s seems to be just about control/being controlled and that doesn't necessarily have to involve sex, right? And what about people who have a vanilla relationship and parallel to that they serve an online or r/l Master or have a sub? Those don't necessarily involve sex...at least not in the classic sense of intercourse. Seems that a lot of BDSM stuff is non sexual anyway...pain? humiliation? They're not about sex essentially?

So, yeah...I think it's possible. But to me personally, there would always be something missing if this was the only relationship I was in. I love sex too much to go without it for a long time.