I think some of the interest comes from the way that these games still key off real world conventions, and along the evil path, Minthara is oddly one of the more sex positive characters in Act 1. They played it up further by going all porna with her in the celebration scene. Basically the Evil path S&M one night stand, where she still tries to kill you afterwards, unless you really thread the needle there lol.
Nah... I associate sex positivity with having the necessary space and time to actually figure out stuff like; what and who you desire, and how, and in what form, do you want to be desired etc. And of course being able to act out those desires, without the inertia of oppressive culture dictating these things for you.
And let's face it the drow culture, apparently initially conceived as a inverted parody/fantasy of feminism/patriarchy, is suffocating in this regard, and Minthara is pretty much the shattered product of said culture with markedly little agency of her own. As far as the S&M -genre is concerned, I don't think a person like Minthara, so lacking in agency, qualifies as a domme, since you're submitting primarily to the organization she's incorporated into as a puppet, not to a person.
The promise of being led to death is reason enough to follow.
