I don't know what the mentality is behind these kinds of classes. Is it naivety on their part or something more sinister
We have already seen many cases reported in the papers about women who have died during " rough sex" and one who's body was basically mutilated with bottles because that was consensual " rough sex" too 
I think its very obvious what/who benefits from children "willing and aware" of extreme sexual practices and which are being taught that not only are they normal but that with the girls, they no longer have any safe space they can hide in.
If you look at the full picture
No private spaces
No awareness of their own bodies ( women have dicks now)
No boundaries allowed
Dangerous sexual practices normalised
These kids are going to end up mentally and physically abused or dead at this rate 

We know exactly who this benefits
And as a PP has said, it doesnt tanw much digging to realise its the same few people it always goes back to. Every time