Thanks but my question (just out of curiosity) was do you call it a BDSM romance (as per the title of this post) or is it a romance in which the couple engages in BDSM?
You can have both, really. Some people just enjoy BDSM. Some people aren't interested in sex unless some aspect of BDSM is involved. And some people can't have a romantic attraction to someone unless there is also a sexual attraction to them, and their sexual attraction is predicated on BDSM being involved in some way. I'd consider the first two to be romances in which the couples engage in BDSM, and the last one to be a BDSM romance. At least that's how I look at it. Then there's people who enjoy BDSM but aren't interested in the sex aspect of it (which is probably more common than you'd think), but that's probably not within the scope of this discussion. Also, Natashina is right in that, as far as this discussion goes, it's all really the same thing.
While I LOVE the fact that there was a BDSM romance involved, I seem to keep missing out on the romances I really want by one degree. In Mass Effect, Jack is by FAR my favorite romance, but I've never been able to complete any of the games (except the first one) with a male character. If I'm playing a game and the option is there for me, almost 100% of the time I'm playing as a female. But I loved how aggressive Jack was, and maybe my favorite Bioware romance scene ever is when Jack punches you in the fact and then kisses you in ME3. (I've watched it on YouTube a time or two). God damn it but I want that in a lesbian romance. And then in this game you have Iron Bull who is actually into BDSM, but is male, and I have zero interest in heterosexual romances I've never been able to play through that either.
Someday maybe I'll get my aggressive, dominant, BDSM themed, bisexual/lesbian romance option. Sigh.