Do we know what kids actually think about this? Planners & policy-makers seem to feel it's not a problem, and that it lessens bullying (no idea how) although it is currently illegal in Wales for children over 8 years old apparently.
Lleisiau Merched Cymru/Women's Voices Wales are asking for feedback from girls (or boys) who have mixed-sex toilets in their schools. Ideally from Wales but also from other parts of the UK. So is there any real-life evidence either way?