This has been mentioned in more recent Mumsnet threads already but it is worth mentioning here as it addresses some of the concerns raised in this thread, ie. that this is all a fuss about nothing!
"Click Off" and "Safe Schools Alliance UK" joined forces to deal with Warwickshire's promotion of the "Respect Yourself" programme.
I was horrified to see that they discovered that the materials were much worse than I realised, with graphic descriptions of sexual practices common in pornography rather than the playground.
Whilst this might be intended as "adult facing" guidance for teachers (I think that was the terminology used earlier) it is on the open internet, on a site linked to by schools using the programme, ie. clearly signposted for any children visiting their school website.
(I am catching up on this issue and am not clear yet how much of this material is/was intended for use in the classroom or by children.)
Warwickshire have, apparently, withdrawn endorsement of the "Respect Yourself" web site without comment.
"Click Off" and "Safe Schools Alliance UK" have asked to meet Warwickshire County Council Chief Executive, Monica Fogarty:
Archived twitter thread: archive.md/DmLEr
Truly ironic that - "Respect Yourself" - given the nature of the degrading and dangerous sexual practices it promotes. Definitions of all sorts of activities but not, so far as I am aware, explanations about "biohazards" and risks of physical let alone psychological injury and trauma.
I had not heard of "Click Off" before:
www.clickoff.org
"We aim to raise awareness about the harms of pornography, to share our learning with legislators and build a movement against pornography in the UK.
Click Off draws from the research and experience of feminists. We are non-partisan and our opposition to pornography is not faith-based.
We rely entirely on donations, please consider donating to support our work."
The current state of play with Warwickshire is detailed here - please read and consider some easy "armchair activism" to help with this :
"Open letter to Warwickshire CC: Stop normalising the use of pornography to children"
There is further info buried on this page - scroll down to:
"How a Sadistic Industry is Being Sanitised"
Fifth paragraph after that heading, the info about Warwickshire kicks in:
www.clickoff.org/articles/
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STATUTORY GUIDANCE ON SAFEGUARDING IN SCHOOLS - NO MENTION OF AGE OF CONSENT
My apologies for contributing to the confusion about which Statutory Guidance I was referring to, ie. by failing to link, as promised, to the existing discussion in the "Writing to your MP" thread.
The subject seemed closely bound to the Warwickshire Schools issue so I lumped them both together in one thread here. I won't be doing anything like that again 
I cannot find anything to suggest that this issue has been followed up but maybe someone else knows?
As a reminder of what this is all about . . . copied and pasted from OP but with links added this time:
"Keeping children safe in education
Statutory guidance for schools and colleges on safeguarding children and safer recruitment"
assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/828587/Keeping_children_safe_in_education_part_one.pdf
However, under "Sexual Abuse" there is no mention of age of consent and the impression is given that school children are able to engage in consensual sex, with anyone.
I have flagged @Spero (Sarah Philimore) and she is going to have a look at all this and advise if it is as bad as it looks.
The discussion starts here, in the thread "Writing to Your MP"
www.mumsnet.com/Talk/womens_rights/3698659-Writing-to-your-MP?msgid=90304780
There are 18 consecutive posts in the "Writing to your MP" thread where I copied and pasted the relevant sections from the Statutory Guidance on Safeguarding in Schools
AND the relevant sections from the CPS Guidance on Child Sexual Abuse and the Sexual Offences Act.