The answer for me is that I'm much too much of a coward to go out totally en femme and anyway am sure my wife would flip her lid!
My body would hardly be convincing dressed in female attire and not particulary pretty.
However, I'm crazy about sexy lingerie of all sorts and just love to go out sometimes; seeing how many different items I dare to ware under my man clothes. This gives me a huge thrill and keeps me excited during otherwise ordinary shopping trips.