Is it true that what is known about احتلام (nocturnal emission) is that it is the release of ejaculatory fluid during sleep due to an arousing dream, while جنابة (major ritual impurity) is the opposite? And is purification obligatory when one enjoys sexually arousing scenes without the release of ejaculatory fluid, especially when suffering from obsessive-compulsive disorder?

Janabah (definition) linguistically is the opposite of proximity, and Islamically it is the major ritual impurity that prevents one from performing acts requiring purity, such as prayer. It has two causes: sexual intercourse and ejaculation. Therefore, if one has a wet dream but does not ejaculate, ghusl (definition) (ritual bath) is not required of him. However, if one finds wetness (semen) on his clothes after sleeping, ghusl becomes obligatory. A Muslim must lower his gaze from what incites him.