I used to go to a chiro regularly, and they would always press on my sacrum to adjust my hips, but didn't seem to accomplish much - nothing popped like when they'd do my spine. In the past couple months, I've started doing pilates and yoga frequently to help combat my chronic pain, especially in my hips, and now all I have to do to crack my sacrum is to be laying down, either on my side or my stomach, and twist my hips slightly. I can crack it over and over again, and it's become part of my going to sleep and waking up routines to crack it a few times. I seem to have a lot of pain focused on my sacrum, and popping it is simply delightful, and, like many others have said, almost orgasmic.
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RE: The sacrum.