Could you explain your arguments in more detail please? I don't see how permitting an 'X' marker for sex will reduce discrimination. Depending on the country th

Could you explain your arguments in more detail please? I don't see how permitting an 'X' marker for sex will reduce discrimination. Depending on the country the passport holder is entering and its border control policy, it may well increase the risk of being discriminated against. I also don't really understand what parallel you are attempting to draw between sex and race - they're very different types of classification, in many ways. For example, sex is either male or female, and typically easily determined by fundamental biological features - but how would you even begin to usefully classify race, and from the global, international perspective expected of passport documentation?