I went to XSport in Merrifield for 14 years (until Covid). The sauna and steam room were both very active and sexy, but the showers were always crappy in terms of plumbing and hot water; it was also not the cleanest gym.
When I was ready to go back to a gym post vaccination, I went to 24/7 in 7 Corners. It was much cleaner, but in 2-1/2 months there I never had a friendly conversation. Also, the sauna and steam room there are co-ed so it was not likely to ever be as cruisey as XSport. Neither has opened up the sauna and steam yet, but both promise to do it in July.
SpaWorld is apparently not open yet, and there's a new KingSpa due to open in Chantilly in July, as well. KingSpa looks much grander than SpaWorld. Can't wait!