So in New Zealand, teachers have been required to inform parents that we will be teaching a sex-ed or puberty unit and majority of parents consent to it. When I was teaching I actually found it opened up conversations at home that parents had been unsure how to have with their kids, which was great. Our government is currently discussing adding in menopause education to our sex/puberty lessons. This only applies to the formal unit of teaching in the classroom--not to teachers helping individual students though or overall student discussions. It would be so weird (and wrong) if they applied it to every informal discussion.