Her instructor, Betty Dodson, the great artist turned sexual intercourse educator and evangelist for woman self-stimulation, was preaching the gains of the Kegel-like exercising that Ms. Dodson maintains can aid cause an orgasm. Sure, an orgasm can be noisy at periods. A performer to her core, Ms. Dodson has cultivated a persona that swings among gruffly abrasive and genial, and she can be wryly funny at times.