To be cliched, variety is the spice of life. I enjoy sex with the BDSM element, I enjoy it without. I couldn't have an exclusively BDSM based sexual relationship, however, as sometimes I enjoy slow and sensual in the manner that some would call vanilla. In my head I know it's still with the man I call Master, but physically there are no crops or canes and no restraints. On the flipside of that same coin, just slow and sensual would leave me rather bored after awhile - bring on the cuffs and collar!
As for bondage without sex? I do adore it, whether it's a subtley concealed collar in public or my new favorite fantasy, a karada harness under the clothes or around the house. That feeling of being hed and owned, while erotic, need not always end in sex.