Forget the pink pill, try a placebo: At long last, researchers say they just might have discovered the secret to "female Viagra" -- so long as you believe they have. Cindy Meston, a clinical psychology professor at the University of Texas and co-author of "Why Women Have Sex," recently reviewed the findings of a past clinical trial for using Cialis to treat female sexual arousal disorder in women. The male erectile dysfunction drug didn't do much for the ladies -- go figure -- but something else stood out, so to speak: the placebo effect.