In 'Taboo Threeway,' Rory Knox, the innocent patient, is about to receive more than just psychological help from his therapist, Katie Morgan, and her step-sister. The doctor, played by Belinda Clark, transforms the therapy session into a taboo, three-way lesson. As the doctor commands, Katie and Rory embrace their desires, their moans filling the room as they rub and lick each other, following the doctor's orders to the letter, culminating in a satisfying, rough climax.