I think many people fail to really get what the nature vs nurture debate is all about. So many CD's are so quick to jump on the band wagon of "I wouldn't choose this lifestyle for myself so it must be genetic".
But just because you didn't actively choose it doesn't mean that it isn't learnt behaviour? Quite often learnt behaviour can be the result of environmental stimuli that you have absoloutely no control over.
Do you ever remember making an active choice to learn your first language? I'm sure you don't, but language is a learnt behaviour that has resulted from environmental stimuli at an early age.
Now don't get me wrong we do have a genetic predisposition for language, in that we have the phsyical ability to speak and the desire to learn a language but the actual language we learn as a child is the direct result of stimuli in the environment.
Apply that to crossdressing? Perhaps there is a genetic or congenital predisposition to femininity but it is the result of environmental stimuli that causes you to become a CD. For example as a young child you are attracted to feminine things as a result of a genetic or congenital predisposition which causes you to try on some of your Mothers clothing. You enjoy the experience as it causes you pleasure (for whatever reason that may be) encouraging you to do it again and as a result it becomes a learnt behaviour that crossdressing is something that you enjoy doing. Just because you didn't actively decided "you know what I want to be a crossdresser" doesn't mean that it isn't necessarily a learnt behaviour.
