Hanne Gaby Odiele, 29, was born with undescended testicles, which were removed when she was 10 after doctors warned that they could cause cancer.
Intersex people are born with a mixture of male and female sex characteristics.
According to the United Nations, the condition affects up to 1.7% of the world's population.
Ms Odiele, originally from Belgium, was born with androgen insensitivity syndrome (AIS), which causes girls to have XY chromosomes usually found in boys.