rape attempts that fail are fine, in fact, when done well can add a lot to the story.
dom/sub isnt really rape...unless it is...like two consenting adults who are into BDSM is fine. but a guy forcing himself on a girl well thats just rape whether its soft rape like coercion (no a violent altercation, no real force used, but there is no choice in the matter) or hard rape (beat them up tear their cloths and force them while they kick and scram and beg)
so if were talking about a girl who is a sub who wants it...i dont see that as rape (unless the context is very dubious, as in the scene playing out goes against the choices you have made so far)
and while off screen rape/abuse can sour the story, IF done well it can work
like an escaped sex slave, you know there WAS rape in her past but nothing happens to her after she escapes
also are you telling me that the only lesbian/ no male content is one girl?