Why do we need to know this? Teams are restricted to no more than five players of the same gender (female, male or non-binary) so we need to be able to fill the team accordingly. Your gender is defined by however you identify along the gender spectrum and the rules have been written by BaseballSoftballUK with inclusiveness in mind. You can read the Inclusive Softball Rules Guidance at this link:
http://alturl.com/v7tuz