+3
To answer the question I believe you're asking, I do think that it's less common that actresses are known for "that scene".
For example, I know that Dakota Johnson was in a movie with lots of sex, but I'm not aware of a specific scene or element of a scene that is notorious.
Maybe it's that sex is more normalized in terms of how often we see it as content outside of erotic thrillers, but even when a film gets attention for its sexual content, I don't feel as though the actress involved then only gets regarded for that one thing.
On the other hand, when you talk about Meg Ryan are you referring to the scene in the diner? And when you talk about Sharon Stone are you referring to the "no underwear" moment? Those are memorable, iconic film moments, but I'm not sure I'd think of either of them as "sex scenes".