Can I also say that your posts were brilliant CharlieParley.
Next bit might be a bit triggering to some.
I was groomed and sexually abused (including rape) as a girl between the ages of 7 and 13.5 by an adult male relative. If I had been asked at age 10 if I had a problem with mixed-sex toilets I would probably have said no (provided they didn't smell and were clean) however at that age I had such a poor idea of what was an acceptable way for others to treat my body that, on several occasions, I accepted two boys removing all my clothes and 'exploring' my body. I had no real concept of boundaries.
If I had been asked at the same question at the age of 13. I would also have answered that I had no problem with mixed-sex toilets because I was so scared that my secret would be discovered and what the consequences could be. An anonymous survey would have made no difference. I wouldn't have risked it. Actually it was learning at this age what boundaries were that enabled me to massively reduce my contact with my abuser and stop most of my abuse. It would have been harmful to me (and my attempts to escape my abuse) to learn that my boundaries should be overridden in order to be kind and inclusive.
If I had been asked at age 15 or 16 (after the death of my abuser) if I minded mixed-sex toilets I would have answered no. I would have been scared that someone would have questioned why and figured out my 'shameful' secret. However it was at about this age that the nightmares and flashbacks started and I started to find it increasingly difficult to be around almost all males particularly if I felt vulnerable in anyway.
By the age of 18, I had been raped once more and sexually harassed many times, I expect I would have excluded myself from anywhere with mixed-sex facilities. However if I had not excluded myself then I would have certainly suffered from more anxiety, flashbacks and nightmares.
I agree with CharlieParley that under Article 39 of the UN Convention on the Rights of the Child that sexually abused girls have the right to all appropriate measures to promote their physical and psychological recovery and social reintegration and that such recovery and reintegration shall take place in an environment which fosters the health, self-respect and dignity of the child. Schools and teachers should be taking this seriously, alongside the need to safeguard an abused girl's mental health and her wellbeing and development. Due to the well documented number of girls who do not reveal their abuse to any responsible adult during their childhood then it is appropriate that impact assessments should take this into account and protect all girls on the basis that sexual abuse is known to be so common and is perpetrated disproportionately against girls.