In the Clone Wars when Count Dooku first encounters Asajj Ventress and she claims to be Sith, he rebuffs her claiming that Sith do not feel fear and he senses fear in her.

However when Yoda is training Luke on Dagobah he tells Luke that to avoid the dark side he must conquer his fear because:

Fear is the path to the dark side. Fear leads to anger. Anger leads to hate. Hate leads to suffering. - Yoda

Does this mean that Dooku was bluffing or do Sith really not experience fear? It seems that they would learn to use it to fuel their passions and thus their power.