Testing the water here in FWR so as not to be flamed with "You want us to add more to our list of jobs?!".
Why cannot teachers teach Sex and Relationships Ed to their cohorts at school? They have the best understanding of their pupils' emotional maturity and intellectual abilities. They have constant training - and often experience - in safeguarding. Most have understanding and experience of presenting contrasting POV and beliefs in a neutral manner. They have training and experience in designing lessons and sourcing resources.
Yes, it's more work, I appreciate that. But isn't it in the best interests of the pupils and of the school?