Actually, the mystery of low libido cannot always be resolved with an increase in
testosterone. If only the solution was that easy
for everyone. Brain chemistry and wiring also plays a role (as do emotional memories), and sexual medicine researchers are hard at work in their search for this holy grail.
If you google Leah Millheiser, MD, the Director of the Female Sexual Medicine program at Stanford University, you can read about her ongoing research in this area.