As often as possible. I also like being braless too. I love showing it all off and having easy access. I almost never wear panties.
As you can see in the photos I prefer no underwear. These are outfits I have actually worn out on the town. The top two I wore on cruises to dinner and the show. The bottom I like to wear when I go bar hopping. I've been on the dancefloor being felt up more times than I can count in that outfit.
I wear very little to allow easier and quicker access to my birthday suit.