We all know the more obvious reasons for their hawtness: They're handsome, they're ripped and, of course, they're heroes. But aside from the valor and the glistening pectoral muscles, there are more subtle cues that attract us to firefighters -- that much is scientific fact. And because we here at Show and Tell are all about science, we're bringing you our findings from the beefcake extravaganza that was the Fired up for Kids 2011 Colorado Firefighter Calendar release party (see the full photo slideshow here
). Calendar photos by Brad Bartholomew Photography; party photos by Coleen Whitfield.