supermassive
User
The only mainstream unisex toilet I can think of is perhaps the toilet in like a Starbucks but they’re single use anyway. Maybe Joanna is going out in Soho and was rattled by the unisex toilet in Rupert StreetAre there genuinely any uni-sex changing facilities at Council run swimming pools, where there aren't also single sex changing facilities available? Or is this another fiction she's created?

