What is the difference between semen and pre-seminal fluid?

Question:
May Allah reward you. Your Eminence, father, the questioner asks: What is the difference between semen and pre-seminal fluid, and what causes them?

Answer:
Semen is emitted with desire, and Allah creates offspring from it. As for pre-seminal fluid, it is emitted during playfulness, without desire, whether during playfulness, remembrance, or looking, without desire. It flows without desire, and nothing is created from it. This is the difference between them. Pre-seminal fluid is ritually impure, whereas semen is pure. The evidence is that it would fall on the garment of the Prophet (peace and blessings be upon him), and he would pray in it. Aisha (may Allah be pleased with her) would rub it off the garment of the Messenger (peace and blessings be upon him) when it was dry, and he would pray in it. So it is pure, unlike pre-seminal fluid, which is ritually impure, because it follows the urine or is a derivative of urine. Yes.