Just in the purple. Again, my girth helps that along.
Speaking of bell curves and percentiles, I would love to see a REAL objective data set on a large population of males, just to see how it really works out. If I had to guess, I would say that somewhere between 75-95% of all men land within the yellow OR green area. Everyone else would be considered 'outliers'.
Calculations of the volumes of hemispheres and cylinders are trivial exercises, but the numbers are inconsequential if the real thing isn't closely approximated by those simple shapes.