They need to telling kids that wanking and (onanist) spilling your seed on the ground (evil gardening likely styxes gardening for the devil series) is bad and they will go to hell for masturbating.Public sex education typically removes the interaction from a moral context.
If you are allowed to tell children that sexuality is natural and give them the facts, not this SJW transkids thing, but a sensible education.
The moral context is or should be taught, absolutely. Like don't make babies and neglect, mistreat , or abandon them if you are going to have sex.
Don't engage in sexual behavior on vulnerable or a non consensual subjects.
It doesn't seem that difficult.