The phrase 'child sexuality' disturbs me greatly.
Of course children have an understanding of physical sensation. Babies enjoy breastfeeding because it feels good to them, children enjoy using the bathroom because peeing and evacuating their bowels feels pleasurable, little boys play with their pee pees and little girls inspect their private parts. None of this is wrong, it's totally natural, however it's not sexuality. It's the exploration of their bodies and learning how their bodies function. It's curiosity as children establish greater autonomy.
Children become fascinated by their private parts at a young age, and they may play games like Kiss Chase or doctors and nurses. A large part of these games is the mimicry of what they think mother's or father's do. It's recognised that children have a dormant sexuality which awakens as they approach their teenage years. Subconsciously all living beings understand on some level what sex is, but this can't be acquainted to children being sexual beings. Children are not physically, mentally or emotionally ready to process actual sexual activity. Even some teenagers aren't mentally and emotionally able to process sexual activity. Little boys may have crushes on teachers, little girls may 'flirt with' aka try to manipulate their fathers. This does not equate to sexuality.
As a child I used to love putting on lipstick, dressing up and singing along to provocative song lyrics. I also loved to run around my house naked. I didn't really understand what any of this meant. If a grown man decided my wearing lipstick, a feather boa and singing along to Britney meant I was up for it he'd be totally wrong. I'd have been terrified and traumatised and wouldn't have understood how my behaviour correlated to his response to me.
Children mimic, copy and explore their bodies. This is part of childhood. It is not for adults to call this normal behaviour a sexuality and try to involve themselves in the process. Even if children flirt, kiss, play, be silly and explore what all these concepts mean, this behaviour is same-age related, not adult related. Besides it's a whole other thing to put a camera/male gaze/voyeuristic lens on this behaviour for people to watch.
Edit to add: this is how nonces induce shame in children as they groom them. They tell them that their curiosity about their bodies, even their ability to feel pleasure from touching their bodies (as all humans do) means they are ready for sex, and therefore brought the abuse on themselves, as they must have wanted it and should feel dirty and ashamed for leading on the nonce in the first place. Children get very damaged by this message and start to feel that the whole mess was their fault.