Germany has become the first country in Europe to allow babies with the characteristics of both sexes to be registered as neither male nor female, with the introduction of an X designation on passports to follow.

Sarah Graham, an intersex woman and counsellor, said there was "absolutely no visibility for intersex people in the world".

She said many intersex people were happy with their gender, but "it would be nice... to have a box where you can choose to come out... as an intersex person."