Locked Advantages,
Sex is not (for some of us) a key ingredient of BDSM. I am not a sexual person as I am not comfortable thinking of myself as a sexual person (to much rejection - the way I was brought up? _ who knows) but I am more on the mental spectrum of submitting. I enjoy doing "the little" things that make life more comfortable such as getting a cup of coffee, dishing out a plate of food, grabbing a sweater or turning up the heater. That sort of thing.
BDSM is what ever works for you. There is no one true way to BDSM. The hard part is finding one who fits your needs.