You nailed it right there. The groups that give "ratings" to movies and television shows are more inclined (my observation, at least) to show violence to kids instead of the human body. In other words, killing someone is more likely to be shown in popular movies than having sex. My theory is that the WA podcast gets the explicit tag because of the "F word" more than the violence.
Regarding Scratch, I think she shows some interest in Lizzie at the first meeting. And during her story about her rape, I got the impression that Scratch may have decided to be done with men.... I could be wrong though.
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