Is any keyword, that includes the word "rape" in it, considered too problematic and taboo to be listed?

Two months ago, I submitted the following keywords for the title "No Exit" (1995) :

homosexual-rape

male-rape-victim

rape

rape-victim

rapist

None of them have been listed yet.

The reason given is:

Unable to verify.

Your contribution has been declined. We have been unable to verify your contribution.

Can anyone throw any light on this? I would like to know what I can do to get these keywords listed, as all of them are pertinent to the subject matter of the film.