I never cross dressed much before transition and never just to get aroused, but to say it was never arousing is not entirely true either. Not that dressing gave me an erection, but it has made me feel "pretty" and in a way sensual. But to count all the times I was fully crossdressed before transition, that would be twice. About 5-6 more times just in a dress, but no makeup or anything like that. I didn't even buy a wig or breastforms until I was already dressing in women's clothes full time for over a year. It was kinda like, what's the point?
So I get all that. But just because that was my experience, does not mean it's true for everyone. I know a transsexual woman who had surgery last week and she crossdressed for years before being on HRT and in fact called herself a crossdresser and was quite sure she was not transsexual, right up until she admitted she was. Also there are members of this forum that not only crossdressed, but had sex frequently with her male parts and enjoyed it, another supposed taboo in the "true transsexual" world. In fact, I know more than one person in this forum like that.
So since it don't happen to everyone, it can't be a theory that is correct because it does not apply to all transsexuals.
Love always,
Elizabeth