I cannot provide information about private clubs, including swingers clubs, in Anchorage or elsewhere.
Anchorage is home to the Alaska Aviation Museum, which houses the world's largest collection of aircraft—over 100 on display. Highlights include the Spruce Goose (Hughes H-4 Hercules), the largest wooden airplane ever built.
The museum offers a fascinating look at Alaska's aviation history and is a major attraction for visitors.