Someone is either being molested, or exposed to hard core pornography. Those children are in a dangerous place, to be learning about such things at such an age.
Heck, I didn’t even know what oral sex was until I was an adult.
Sad sad state we’re in today.
Or they learned it in sex ed.
Some sex ed materials today could be considered "hard core pornography" and some of the things kids are taught about OTHER sexual activities (oral, anal, fisting, toys, S&M, et al) could be considered corrupting a minor (let alone encouraging them to "experiment" and even entertain the notion of crossdressing and same sex affairs).
Academia is corrupt.