OK, so have I understood this right? You are advocating teaching the facts about sex and contraception, including acknowledgement that some religions think contraception is a sin. And that teachers must check the content for any instances of "boundary crossing" or potential to trigger students who may have been abused.
Does it therefore follow that discussion of sex as part of a relationship (I.e. more than the pure mechanics) is not something you believe should be covered in school?
How does your approach safeguard teenage girls from inadvertently getting involved in a coercive, controlling or abusive relationship?
How should schools educate children about healthy relationships and coercive control without discussing sex and boundaries?
We know coercive control and abuse is an issue in teenage relationships; we know without intervention, people who have been in an abusive relationship (as abuser or victim) are likely to repeat that experience throughout their lives.
To me, it's not "safeguarding" to avoid teaching children the skills they need to recognise abusive relationships. And I can't see how a school could teach that in a way that complies with your guidelines.