I was in Denver earlier this summer and wrote about my experiences as part of my blog. You might check that out. The entries about Denver were published in late June.
http://blog.cruisingforsex.com/
You should also check the Sex Listings for Denver. Start your search here:
http://listings.cruisingforsex.com/cfs/index.php
Denver is a great city for sex. Hot men and what seems like a very sex-friendly attitude. Enjoy!