Women: What's your favorite saddle?

My Missus always complains about her "tail bone" hurting after long rides. She seems to be fine on short commuter runs though.

Any recomendations for a lady from the ladies?

clarify what she means by "tail bone" and have her point if necessary. if it's the part in the center, the sacrum, then she's sitting entirely wrong and needs to readjust posture to be more on the "sits" bones.