I wouldn't think there would be too much of a difference. I hadn't heard the term bi-gendered used before. Crossdressers don't usually stay in that mode for long periods and change back to their regular modes out of necessity.
Bi-sexual means the person is attracted sexually to either gender.
Bi-gender means, as already stated, the person moves between both gender roles and mannerisms. Crossdressers do the same thing.
Bonnie
