Must a woman perform ghusl if she experiences a wet dream and feels pleasure and safety in the dream, then wakes up completely dry? And what is the criterion for differentiating between maniy (spermatic fluid) and madhiy (pre-ejaculatory fluid) in women, especially with continuous moisture and the sensation of contractions that might be confused with other causes?

If a woman has a wet dream but does not see any semen, then ghusl (ritual bath) is not obligatory upon her. This is because the basis for the obligation of ghusl is the sight of semen, as the Prophet, peace and blessings be upon him, said: "If she sees water, then ghusl is obligatory." If there is doubt about the emission of semen, the default is that it has not been emitted and ghusl is not obligatory, as stated by the Permanent Committee (for Scholarly Research and Ifta): "If a woman doubts that she is in a state of janabah (major ritual impurity), then ghusl is not obligatory upon her merely due to doubt, because the default is the absence of janabah." Contractions in the vagina are not an indication of semen emission; rather, semen is identified by its distinct characteristics. The default is that any discharge a woman sees is among the known normal secretions until evidence indicates otherwise.