Firstly, get that Grafenberg smut out of your mind... :-)
I seem to have blood chemistry that Dexcom engineered the G4 for.
I just hit the 3 day Mark on my latest sensor, the point at which it gets really accurate. Scary accurate. Stays that way through at least day 14... Two weeks is typically what I get out of a sensor.
With very rare exception, my G4 will be within +/- 10 mg/dl of my Omnipod (Freestyle) meter, more often than not +/- 5.
This is cruisin' time for BG management... of any tool, my CGM has played the biggest role in making really good control possible.