What is the ruling concerning the white fluid discharged when thinking about sexual intercourse, and does it necessitate Ghusl or Wudu'?

Our advice to you is to adhere to the remembrance of Allah and stay away from reading stories that arouse lust. Replace them with reading religious or scientific books. You should also associate with righteous women and be diligent in expelling satanic thoughts. As for the white fluid you see when you think and lust surges, it is most likely madhiy (pre-seminal fluid). It is impure, and you must perform istinja (definition)' (washing of the private parts) from it and purify whatever it touches on your clothes and body. You are not required to perform ghusl (definition) (ritual bath) because of it; rather, only wudu' (ablution) is sufficient.