If someone had said to me a few years ago that one of the most controversial subjects I’d ever write on would be women’s freedom to assert their rights to single-sex spaces, services and sports, I’d have thought they were crazy. I wouldn’t have believed that in a mature democracy people would lose livelihoods, be kicked off degrees or be issued with unlawful police warnings after expressing the belief that sex remains materially relevant in society, a moderate and widely shared view that remains the current legal position in the UK. But the bullying tactics of campaigners who believe that...