Isn't part of Japanese culture, or at least H-culture to just say no and stop and dame all the time? Things that are perceived as "rape" here are a part of the mating ritual, so to say, there. Erring on the side of caution on this would cause almost all works involving sex to get a Rape tag.
As far as H goes I only consider it rape when 2 people are strangers/get completely forced(as in physical and not verbal objection)to have sex/ bondage or similar inability to act is involved, that sort of thing. And honestly, this consent thing has become pretty ridiculous as of late, please don't poison the chinese cartoon porn with this SJW stuff. Although the mangakas(many female!) themselves did actually deflect the SJWs recently IIRC so that's a good sign. The main point was fiction is fiction, reality is reality.
As for people who do get triggered by such really slight 'rapey' situations maybe they should change material altogether or search on an artist basis maybe.