I know you said DC, but Tabu is one in Baltimore. I heard that is nice, but have never been. TPA is another. There are others in the DC/MD region. If you're up for a little drive, there are some over the border in PA. Used to go to TJs north of Harrisburg all the time when I lived there. I'd create a profile on SLS if I were you. That type site is swinger friendly, and have search sections for clubs. Also easy to get to know like-minded individuals. Even if you're not into swinging, those clubs are great for going and showing off too.