Damn, those ladies are hungry! They need to be taken to Chippendales or something, blow off all that pent up energy.
Personally I don't think the scenes you mentioned were that bad? Unless you're showing a slow-mo lathe style death (Seriously, don't look that up, it's very graphic and disgusting.), or something along those lines of gore, I don't the villain's death would be too bad. Although if your story is intended for children, with a very young tone, I can see it probably being a bit much. The booty scene also seems pretty tame? Sure, it's a bit uncomfortable, but doesn't seem graphic from how you describe it. Unless Jack is a child or something, which it feels that way with your description, then yeah. That might be a bit much.
Really though, I don't know the overall tone you prefer to work with, and I myself have scenes that some would consider "going too far" so I'm not the best judge. Lmao! xD
Let's see...
CW: SA and talk of fetishism
There was a single time I changed a scene for similar reasons, it was going to be an implied softcore SA scene where the MC's partner was touching them inappropriately while shaming and saying fetishy things about their anatomy. (The MC is intersex.) The scene was meant to be upsetting and invasive, while showing a part of why this character's partner keeps them around, but a few folks I talked to told me it would be a little much. In the end I changed it to the scene I have now for the opening of my current chapter, which looks a lot better overall while still having some of that invasive discomfort.
I've changed up or gotten rid of a good few scenes, but that was the only one where I did it for such a reason. My story in general is meant to be uncomfortable since it focuses on heavy themes, so I feel I'm doing my job when someone gets upset by it's contents. That being said sex is an especially difficult subject to tackle in a non-sexual way, it can easily delve into porn or fetishism, so I approach those scenes with more caution.