Well, I guess there are several reasons. I think the primary one is that it's as close to being a woman as I can get without actually being one. For most of my life, I've wished that one of the little X spermies had won the chase, and that I'd have been born female instead. By this time in my life, though, I've opted to not travel the path of transition, and so male I am, and male I shall remain. However, I have a great desire and an urge to crossdress as much as I find that I'm able to.
Another reason is that I absolutely love the clothing and everything that goes with it. I like how they look and feel, and the infinite myriad of style, fabric, and color available. I enjoy wearing hosiery and high heels, lacy underthings, jewelry, long hair and nails, and pretty makeup. I like all of it, and I love wearing dresses! So I do it as often as I can.
But, much like Karren said, I could also do without it much of the time. Being caught between genders is a pain that never leaves. It saps time and money from me, and forces me to live in a turmoil that I'd rather live without. But it never goes away for long, and always comes back. So I guess I CD because I have to and because I want to.
