IG -I'm not the best at articulation, but I'll give it another go. :)
"Girls sexualising themselves, without really knowing what they are doing." Can you explain how they are sexualising themselves? Re "Girls wanting to appear grown up and pretty, and part of the society we live in means there are no frames of reference for that that isn't about sexuality." i am not sure that is true, but it may appear so for some children who are not given any other frame of reference.
What I am getting at here is that it is totally normal for teens and preteens to try out being an adult, doing what adults do. They copy role models, and at this age it's normally celebs and slightly older peers. Duckface is supposed to be flattering for the cheekbones, but up along the line has also been used as a suggestive/smouldering expression. It is very easy in a hypersexualised culture for young girls, who are just getting to grips with things, for attractive to become conflated with what used to be called raunchy. No duckfaces aren't raunchy!But there are young teens sending naked selfies and that's a symptom of sexualising themselves, or perhaps better to say, responding to being groomed by society, to a large extent.
Re "Girls are fed a narrative that they are equal to boys in all ways, but they know it's not true." Do you really believe it is not true? Well, it's not true with regards to sexual behaviour. The narrative girls are fed is that being sexual is empowerment, and it's the same for both sexes. But the double standard has not gone away. And it's not boys who are shamed by clips of sex acts being passed around schools.
RE "They need approval and popularity. They start having sex themselves because of this need, rather than for their own desires." There have been lots of referenes on this and other threads to girls being pushed into sex, coerced into sex, threatened with violence if they do not have sex, how is that 'starting to have sex'. We are on the same page here, I'm saying using the need for popularity and approval is how the coercion works. Years ago it was Good girls don't, despite their own desires. Now it's Normal girls do, despite their own desires. It's still female sexuality being controlled.
" 'presenting herself willingly as sex object, doing what society tells her to do and therefore deserves to be denigrated for it'." Does anyone, anyone, really think 11 year olds are doing this?? Willingly.? Yup look at any case in the media, where 'she knew what she was doing, she enticed him, etc etc ' is trotted out. But really what I am getting at here is that girls start to grow up, want to fit in and be liked, which now, more than ever, means presenting a sexual side to themselves. But they get called tart and worse, and it's not even for the crime of being sexual which was always the way, but for the crime of trying to conform.
We're on the same page, I believe, ItalianGreyhound, but I don't mind being asked to unpick because it helps me get it straighter in my head.