Aside from the fact that the term "transgender" means different things to different people, I think the reason that some forum members prefer the term "crossdresser" is that it describes an action as in, "This is what I do. I put on dresses and it does not affect my gender identity". But over time and with a lot of discussion, people are discovering motives behind the need to put on dresses that are beyond the more superficial reasons of liking the way the fabrics feel or finding it relaxing. They are discovering that there are deeper differences between themselves and the men who have no wish to transcend gender boundaries by appearing female, even if they do not want to transition.
In your next post you mention being a straight male. The people in this community span attractions to all five: opposite-sex, same-sex, both-sex, neither-sex, and to themselves while dressed, so one's sexual preference really has nothing to do with the desire to present as the opposite sex/gender except maybe the last one.
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Which brings me to a question for Allisonthegoddess: Have you been attracted to GGs in the past and are now discovering an attraction to men, and would this be a prime reason why you are questioning your gender identity? Just wondering.