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. So, are there enough genders? 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. (Photo: Transgender transsexual concept. Credit: Thinkstock by Getty Images)