Absolutes do not exist in storytelling. I swear Lily herself said those exact words in a video, but I haven't watched her content in forever.
The way I see it, there's no such thing as a bad trope. A trope can be overused or cliche, it can be an often misused or an easy to fuckup trope, but it can never be bad. Take fridging as an example, which is often called the worst trope ever devised. Thing is, fridging is a quick, simple way to get your story off the ground and justify why the MC is doing what they're doing, which is what makes it appealing to a lot of authors. In Max Payne, Max's wife and daughter are killed not even fifteen minutes in. This is fridging, yet Max Payne's story is beloved in spite of that, and I personally revisit it every half-year-ish and gain a new appreciation every time I do. Tropes are how you use them.
Sex scenes are in that same category. Are they often superfluous? Is it often more important story-wise that the characters fucked as opposed to how? Do they often read like two maladjusted fuck robots running through janky-ass motions? Yeah, probably. But that doesn't make sex scenes bad, it just means you have to be more careful how you approach them, and in my opinion, the solution to making a good sex scene is the same as making a good fight scene--character. Sex is a vulnerable action that requires immense trust from both parties, and the best sex scenes highlight that. If a character is naturally distrusting, uptight, or introverted, a good sex scene can mark the climax (ha) of their character arc. I know it's shocking to hear, but sex isn't just an assortment of whams and bams and thrusts and grunts; there is indeed a real, complex person attached to that meat rod. Plus, seeing a beloved character in such a position takes the stigma out of sexual pleasure, which I'd have expected Lily to be all for. I'd personally love if more sex scenes allowed for embarrassed vulnerability where the characters openly say stupid shit like, "Well, that was very awkward. Maybe let's just stay friends?"
And the funniest bit is, there are genuine arguments against sex scenes, but Lily is too scatterbrained to think beyond her gut instincts. Not all sex scenes are filmed ethically. Sharon Stone was tricked into removing her panties in the infamous interrogation scene in "Basic Instinct". Additionally, actors know that any scene they star in nude will appear on celebrity skin websites, and it's understandable why a lot of them wouldn't be comfortable with that, even if they agree that pleasurable, realistic expectations of sex should be normalized. These are all things Lily could have addressed to justify her distaste for sex scenes, but she failed so hard it made her look like a whiny brat who demands all media adjust to her preferences.
