I have a ASD diagnosis as well, Asperger's specifically, pleased to meet you :D This is my point exactly, notwithstanding the fact that 'environment' can have an effect on what we consider biology. No-one ever asked me what caused my ASD, just how I deal with it in my day-to-day life (for as far as it has any effect on it at all). That's what I consider more important about cross-dressing as well: how to deal with it instead of trying to find a non-existent or non-reducible root cause.