How is a wet dream determined and what necessitates ghusl, and does watching pornographic images necessitate ghusl, and what is the difference between maniy and madhiy, given the questioner's suffering from urinary incontinence and obsessive-compulsive disorder regarding purification?

Nocturnal emission (ihtilam) is when a sleeping person dreams that they are engaging in sexual intercourse, regardless of whether ejaculation occurs or not.

States of one who experiences nocturnal emission: 1. Nocturnal emission without the presence of semen (mani): Ghusl (ritual bath) is not required. 2. Nocturnal emission with recollection of it and the presence of semen: Ghusl is obligatory. 3. Waking up and finding wetness without recollecting a nocturnal emission: Ghusl is obligatory if the wetness is semen. 4. Nocturnal emission with awareness before ejaculation: Nothing is required of him unless he ejaculates afterward, in which case Ghusl becomes obligatory.

A young man who frequently experiences nocturnal emissions is advised to hasten marriage if he is able, or to increase his fasting if he cannot marry, based on the saying of the Prophet, peace and blessings be upon him: "O young people! Whoever among you can afford to marry, let him do so, for it helps in lowering the gaze and guarding the private parts. And whoever is not able to do so, then he should fast, for it will be a shield for him."

Not everything that exits the male organ is semen; it could be pre-seminal fluid (madhi). Madhi is impure and does not necessitate Ghusl; rather, ablution (wudu) is sufficient for it.