The United Kingdom redefines women by biological sex: the decision has a major impact.

Late last month, the UK Supreme Court ruled that the definition of woman must be based on the biological sex assigned at birth, meaning that transgender women do not fall within the legal definition of women. It determined that even those with a Gender Recognition Certificate (GRC) would not fall within the definition of female.

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"The concept of sex is binary; a person is either a woman or a man," the court ruled.

Another decision made by the high court is that if a space or service is designated as women-only, a person who was born male but identifies as female does not have the right to use it, as is the case with restrooms.

What have been the effects of the ruling?

According to the BBC, the High Court's ruling has had two effects. The first has to do with bathroom use. The UK Court argues that women should continue to use the designated bathroom, while transgender women should use the men's bathroom. Therefore, in complying with this decision, Equality Minister Bridget Phillipson revealed to the BBC that trans women should use the bathroom based on their biological sex.

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"The ruling was clear in stating that access to benefits and services must be based on biological sex ," she said. Previously, Phillipson had said that the law on trans women's access to sex-segregated spaces based on biological sex "would be applied across the board."

Another impact this ruling has had is on the sporting level. The Football Association (FA) announced that transgender women will no longer be allowed to play in women's football in England starting next month.

"This is a complex issue, and our position has always been that if there were a substantial change in the law, science, or how policy works in grassroots football, we would review and amend it if necessary ," the FA said.

The Scottish Football Association, in turn, took a similar decision, also motivated by the application of this ruling by the UK Supreme Court.

It's worth noting that the FA had already amended its regulations on April 11, implementing stricter eligibility criteria. These included proof of testosterone levels measured in the previous 12 months or a history of hormone therapy, among others.

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