A scenario is, after all, on some level, a work of fiction. Fiction should be able to deal with darkness, and all the dark things that come with reality. Not all of the testers liked it. It's gray, and ambiguous, and there's no right answer. Instead of telling people to use their common sense, I'll say to be grown-up about it.
Rape is a serious, serious, horrible thing.
If you're going to refer to rape in your scenario, be damn sure to be dealing with it with the seriousness it deserves. That's the key. This is exactly why I included the ratings system. I wanted people to be able to deal with grown-up issues in their scenarios. Just as with any other sort of fiction, not everyone should be limited in what they right to what is appropriate for an 8 year old to see.