Denver's most notorious swingers' club is roomy and loud and full of sweaty sexual "explorers," as its website says, dancing, drinking (their own liquor), lounging on couches and, well, doing it — either in semi-private cubbies outfitted with curtains and beds, in the hot tub or in the exhibitionist shower. But don't worry: The friendly Scarlet Ranch staff changes the sheets and replenishes the condom supply on a frequent basis.