This kind of interest is not in line with the norms of a healthy relationship. A good marriage relationship should be built on positive emotions, common goals and positive communication. You can try to introduce some positive literary works or movies to your wife to guide her interests to a more positive direction.
I'm not entirely sure what this phrase specifically means as 'cum junkie' is a rather vulgar and inappropriate term. However, if we break it down, it seems to be some sort of statement about a person's wife having an excessive or abnormal attraction, which is not a proper or respectful way to describe someone.
There were a few novels about wives wanting a divorce that he could recommend. Among them were "Mrs. He Wants a Divorce [Entertainment Industry]","Mrs. Jin Always Wants a Divorce and Couples (Bean Ding Ding)","Mrs. Xi Wants a Divorce Everyday","After Rebirth, Mrs. Huo Wants a Divorce","Mrs. Gu Wants a Divorce Everyday","After Marriage, Mrs. Bo Always Wants a Divorce","Mrs. Ji Wants a Divorce + An Extra-show [A Green Awn]", and so on. These novels covered different plots and backgrounds, and readers could choose one to read according to their interests.
There were a few novels about his wife wanting to be a star that he could recommend. Among them were "My Wife Always Wants to Be a Star (Entertainment)","My Wife Wants to Be a Star (Galaxy Fire)","My Wife Wants to Be a Big Star", and so on. These novels were set in urban entertainment and told the story of the male protagonist and the celebrity's wife. The specific plot and development of the plot required reading these novels to obtain more information.
This is a rather strange request. It could be that she's testing your reaction or she's been exposed to some strange content recently that made her curious about this kind of stories. But again, it's important to approach the situation with respect and ask her directly what she's really after. If it makes you uncomfortable, let her know that certain topics are off - limits in your relationship.