Obsessive-compulsive disorder (OCD) is a diagnosis that is heavily stereotyped in the public sphere, often associated with fears of germs and contamination, which are countered by excessive hygiene, avoidance, and compulsive hand washing. However, do patients visiting psychiatric and psychotherapeutic offices present a different picture of this disorder in reality? Practice shows that the spectrum of symptoms is extremely broad, and a thorough understanding of these symptoms allows for an accurate diagnosis and the application of effective therapeutic interventions that reduce the patient’s real suffering. The aim of this study is to demonstrate the application of cognitive-behavioural therapy (CBT) in treating a patient diagnosed with OCD related to sexual orientation. The method involved the description and conceptualisation of the case of a 36-year-old female patient and the process of psychotherapy based on exposure and response prevention. The therapeutic techniques used, and the effects achieved through them are described. Although further research involving the indicated group of patients is necessary, attention should be drawn to the possibilities and opportunities offered by a method that has been thoroughly proven effective in treating other forms of OCD.