Erotica non grata" is a phrase used in Janet Evanovich's novel Four to Score (
Stephanie Plum Series #4) to describe the character Joe Morelli in the context of the narrator's (
Stephanie Plum) desire to avoid a romantic or sexual entanglement with him at that moment.
Context:
Stephanie Plum makes this declaration, following her motto "Look but Don't Touch" regarding Morelli.
The Novel: Four to Score features Stephanie Plum, a bounty hunter dealing with a reckless waitress, a dangerous rival, and the complications of moving in with vice cop Joe Morelli.
Significance: It serves as a take on the latin phrase persona non grata (unwelcome person), suggesting that, in that particular phase of the story, sexual activity (erotica) is unwelcome or off-limits (non grata)