Ah. Thanks for enlightening us... Behaviour has nothing to do with genetics. I obviously just learned to be left-handed, then?
Surely people are saying the causes for cross-dressing (e.g gender dysphoria) may be genetic.
Genes can't make you a carpenter - but they can provide you with the talents to be a good carpenter, or artist, or fast-jet pilot, or mathematician?
They may be the reason why you feel more comfortable wearing clothes of the sex opposite to that you were born with.. But I agree, particularly given the range in which we present, it's highly unlikely that there's just one cause.