I like both of these answers for myself.
I find women attractive and always will. That doesn't change when I dress as a woman.
Bare minimum, my woman would accept that my female side exists prominently, while understanding that I'm still very much a man in the end. For her to find a female friend in me would be a bonus -- I'd just be the girl friend she couldn't complain about her husband to, though everything else would be fair game :)