Gender identity is considered more fluid than ever because of the success of the trans movement. But most trans people, just like everyone else, still identify as either a man or a women. For those who feel they are neither – or both – the male/female distinction does not fit. And for the one in 2000 who are born with indeterminate sex, finding a place in this binary world can be damaging. We hear from Dr Imran Mushtaq, who works with intersex children at Great Ormond Street Hospital in London; bi-gender vlogger Brin Convenient; Tamara Adrian, Venezuela’s first transgender congresswomen (who wants gender erased from official forms); and the writer Mark Gevisser. This programme is part of the World Service Identity Season. (Photo: Transgender transsexual concept. Credit: Thinkstock by Getty Images)