Is there any solid evidence that the school was teaching that there are 70 genders and about choking? It all seems to be hearsay.
If kids are going to be taught about sex, I don't see that there is anything wrong with including oral and anal.
When I had sex education back in the dark ages we were only taught about the very, very basics of sex and of course did not deal with anything other than heterosexual relationships. It was hard ,(fnarr) to work out the finer details of how it all worked, let alone imagine sex could be fun.