I was heavily pregnant in China, Japan, England and Ireland last year (I had to do a lot of travelling). In China, the toilet provision is squat toilets, and I was totally unable to use them because my joints had gone funny and I couldn't physically squat, my knees buckled and I got stuck, and there was often not one single seat toilet (only provided in most parts of China for disabled people, and often not provided at all), I really do think women's needs are different to men's when it comes to toilets and that they think we just have a pretty dress on the sign so it's for people who like to wear dresses.
The fact that a tossy man "invented" a toilet last year that was angled to stop people sitting on the toilet for too long by making them feel uncomfortable says it all. Men go to the toilets for recreational purposes. They like to use the cubicles to "read a magazine" or whack one off (or to buy/consume illegal substances), with or without another person present. Men don't have to do all the faffing around women have to do in a toilet. They don't have to get their fingers right to the start of the feed on those horrendous "smart one" dispensers to get more than one sheet because it's their period (because they don't have them). They don't have to wipe the seat clean to have a quick wee because the person before them was on the blob and didn't wipe up. They don't have to fiddle with their clothing and find somewhere to put their bag when the hook on the back of the door's been broken because their clothes are designed for function over form with actual, usefully-sized pockets and their tops don't have dangly bits like many of ours do (especially our jumpers).
It says it all that a man looked at the queue leading out of the ladies one day and thought, "I know, they're spending too much time sitting on the toilet chatting and having pillow fights and comparing their breasts, I'll invent a loo that they can't sit on and I'll profit massively from causing women discomfort with my angled toilet solve all their problems."
Natal women physically need to be able to sit down, especially when pregnant. Women's toilet provision in England is already not great compared to other countries; in Japan, all the toilets (male and female) have little fold-out child seat places inside the cubicle attached to one wall, away from the toilet, where you can put your baby safely while you use the loo.
In Ireland, I haven't seen any toilets that didn't have extra space for a pushchair in the cubicle (although I'm sure there are some, somewhere). Per square metre, we are not as pushed for space as Japan, so if they can sort their loos out to work better for women, we can, too.
Bugger spending bandwidth working out all this third space nonsense for people who are about as grateful as that ex-leper from Life of Brian. We should be spending this mental energy making toilets better for actual women and making our own lives easier.
And the rule should be, if you can write your name in the snow with perfect precision, the ladies' loos are not for you. Because you don't need to sit down except to poo, and you probably don't need toilet paper. And you can physically use a toilet even if someone else who can write their name in the snow accurately has mysteriously inaccurately widdled all over the toilet seat and floor. Simple.