Parents are not always suited to be teaching the subject.
No teacher I've had is anything but another parent. To expect that they have some ability above any other parent is assumptive.
There is a wide range of knowledge available in the study of sex, from mechanical to spiritual to medical.
Yup, and there are multiple books/websites, or other learning sources, on any one of these aspects.
This is something that a ciriculum can teach.
OK, but without the teacher being something other than another parent, I don't see how the curiculum is any stronger than the one teaching it, so we can still leave it to the biological parent, who can look up, or come up with a curriculum on their own.
The curriculum, assuming it's from a public school, should have nothing to do with the spiritual knowledge of sex. The spiritual part (please note that I've wrote that the biological part of sex
should be taught) isn't even recognized by science, so IMO, there is an entire aspect of sex that is being left out of public schools.
But it isn't up to me what is taught in public schools.
So.. as you said...
This is something that a ciriculum can teach.
Which I agree with on the biological level, but there is something else about sex that people recognize, and this is the aspect that I want to be left up to the parents.