"I designed the SEX DRIVE pedal to fulfill the very particular needs of good friend Charlie Sexton.
The goal was to build a “clean-boost” pedal that would supply additional bottom end and sustain when needed. The pedal would have to provide a boost that would not alter the original quality of the amplifiers natural tone. Most important, was to not add a “nasal” tone like the other pedals in his effects graveyard.
The result was the SEX DRIVE pedal"
You can find the original FSB thread here.