Sex education, if done well, should be done and can be great.
Children should know about proper hygiene, how their body parts operate, how to spot the signs of being groomed or being abused, and by the time they are past puberty, the dangers of unprotected sex and random hookups.
For children before puberty, the focus should be on self-defense from pedophilic tactics. Many children were sexually abused and didn't tell anyone because they didn't even know what sex was.
After puberty, it becomes an unavoidable reality that teens are horny and should be taught how to avoid the physical and mental dangers of not being careful with who you have sex with and how.
Spiritual concepts related to this like avoiding race mixing can also be taught.
Ideally, this should be taught at home, but there's no way to guarantee this is done well, so whether it should be standardized at school or left to the individual families is up for debate.
The elephant in the room here is that jews promote harmful ideologies through this, which should be addressed.