The Equality Act makes it clear you must not be discriminated against because:

• You are (or are not) a particular sex
• Someone thinks you are the opposite sex (this is known as discrimination by perception)
• You are connected to someone of a particular sex (this is known as discrimination by association)

In the Equality Act, sex can mean either male or female, or a group of people like men or boys, or women or girls.

(Blackpool Council, 2024)