We should look for books that contain positive themes like self - growth, cultural exploration, and moral teachings instead of this inappropriate content.
I think this is a very strange and potentially inappropriate question. Stories should be based on positive and meaningful themes, not something like this.
Since the title is rather unclear without more context, it might be about some sort of relationship dynamic. 'Cucks' is often short for cuckolds which is related to certain relationship concepts, and'submissive' implies a power dynamic. But again, without more information, it's hard to say for sure.
One way is to be self - aware. Always think before speaking and consider if the topic is appropriate for the general audience or the conversation setting.