How can one differentiate between semen (مني) and prostatic fluid (مذي), and how does prostatic fluid exit, and is its emission related to sexual fantasies or to thinking resulting from non-sexual scenes?

Semen is a thick, white, or yellowish fluid in women, with an odor resembling dough. It is expelled with a forceful gush, accompanied by great pleasure and followed by a sense of languor, and it necessitates ghusl (ritual bath). As for madhy (pre-seminal fluid), it is a thin, white, sticky fluid like water, which is discharged during minor pleasure without a gush or languor. It is impure and only nullifies wudu (ablution), and it does not necessitate ghusl.