Elsewhere, Tatchell specifies that he means sexual practices such as sadomasochism (his words). I cannot see how talking about this in a mixed sex class, even if the teacher emphasises that some people may find the practice distasteful, won't risk some of the young people especially the girls being pressurised to try it.
Even if the idea is that sadomasochism is explained very briefly, how will the teacher prevent some of the sixteen year olds discussing it in more depth either in or outside the classroom?
How will a teacher teaching both that consent must be gained and that you shouldn't do anything that makes you feel uncomfortable ensure that the young people will actually go away with a respectful understanding? If only it was as all as simple as educating about consent. Equally, educating about boundaries and coercion, whilst incredibly important, needs to be sensitively done.
Whilst I am sure that some young people will discuss sadomasochism anyway, this will surely legitimise it being discussed in the school dining hall or at home between a young couple. How can the teacher ensure the safety of the girls, in particular?
I don't get the impression that the idea is to actually discuss how unrealistic porn makes sadomasochism appear or that it can be harmful.
Equally, a lesson like this on such sexual practices could well be deeply upsetting and traumatising for any child who has experienced sexual abuse. Not all of these young people will find a way to get out of attending the lesson, or any discussion that takes place outside the lesson, but Tatchell does not make any suggestion in his proposals about how to deal with this.
Where is the safeguarding framework within some of those proposals to protect girls from being pressurised into potentially harmful sexual practices that have been discussed, and perhaps in the minds of some legitimised, in class?
Where is the safeguarding to ensure that abused children are not traumatised or made more vulnerable if these proposals were implemented?