There is much written here about how we should just enjoy our CDer nature and not try to understand what is behind it. I agree mostly with this and it is indeed mostly what I do. However, all the while there is this small voice inside saying: “What is really going on here? Why am I doing this?”
And in spite of all the advice I do try to make some sense of it. So here are a few thoughts.
First off is the idea that it's just a random desire of mine to dress in women's clothes – no motive, no reason, I just do it. This is not very satisfactory, first because it doesn't get us any further and second because it's generally believed that we always do things for a reason (even if the reason is unknown).
Second is the perversion theory: what I mean by this is, I know it's inappropriate, so I do it just to be perverse. I have difficulty with this because the wearing of the clothes actually feels natural and right, not perverse.
Third we have a refinement of the perversion theory: autogynephilia. I mentioned this before on this forum and it turned out it was a dirty word in some quarters. Anyway, the idea is that somewhere, somehow in my development I got into thinking it was an emotional and/or physical turn-on to appear to be a woman. I can't dismiss this entirely but again it doesn't ring true with the way I feel when I CD.
Fourth we are into more of a transgender area: I have a strong feminine aspect to my personality which seeks outward expression by having me appear in female guise. This one actually works quite well for me, because my time as a fully-realised crossdresser (i.e. Ruth) has had considerable benefits in making me more settled and fulfilled in general, even when I am not presenting as Ruth.
Fifth is the one about me being a woman trapped in a man's body, and needing to manifest as a woman in order to survive. I don't feel strongly that this is me, though I don't rule it out. I have been fully CDing for some years and I am “around 60” but feel no particular pull towards living full time en femme or transitioning. I do sometimes wonder though, whether without my family ties I would just abandon the male persona. Still, that's not a practical consideration.
So there we are. Some of you may find these thoughts helpful. If you have any other theories, please post: I'm open to more ideas. In fact I'd love to hear something different.