Feminism & Co. sells out at the Museum of Contemporary Art Denver; the biggest swingers' outfit in the country, Scarlet Ranch, now occupies the former Northwoods Inn.

Alt-sex marks the spot in this city -- which, by dint of altitude alone, also happens to be the easiest urban spot in the country to join the Mile High Club.

And readers recognize this city's alt-sex amenities.

Say Greg & Sheryl:

Most people outside of Denver don't realize this, but the Mile High City has a terrific alt-sex scene. That's one of the reasons why we enjoy living here.

You won't read about that in the official tourism guides, though. What other unsung assets do you enjoy in the Mile High City?

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