These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Stephanie Plum
Complete Monster: Benito Ramirez is a violent boxer who absolutely loves to torture, rape, and mutilate women just because he can and because he likes to make a point of them that he's so powerful that he can do it to whomever he wants, whenever he wants. In the first book, he stalks Stephanie, even, at one point, calling her in the middle of the night and leaving a voicemail that's being recorded as he assaults a pleading, screaming woman and taunts them both. Later, he rapes and absolutely brutalizes a prostitute, whom Stephanie had spoken to about Ramirez earlier that day and leaves her bloody, unconscious, naked body tied up on Stephanie's balcony. Luckily, in the fifth book, he's shot to death (albeit by someone ELSE trying to kill Stephanie) while trying to break into Stephanie's apartment.
Fridge Horror: Stephanie repeatedly glosses over Morelli's attempts to "play train" with her in the garage when she was little, but it does lead one to wonder why the adolescent Morelli knows about these sex games...
Les Yay: Stephanie and, of all people, Ranger's housekeeper Ella. Apparently Bulgari shower gel, excellent cooking, and well-laundered 700 thread count sheets are inherently orgasmic.
Stephanie: If there was a woman that could make me turn, it would be Ella.
Memetic Sex God: Ranger. Connie, Lula, and Grandma Mazur have all wanted to jump him at one time or another, as well as random women he and Stephanie meet on the job.