What is the ruling on the fast of one from whom semen or pre-seminal fluid is emitted due to looking at pornographic images or films in Ramadan, and does the ruling differ in Ramadan from outside of it?

Repeated looking that leads to the emission of semen invalidates the fast according to many jurists. However, the emission of pre-seminal fluid (madhy) does not invalidate the fast. One must repent to Allah for unlawful looking, as it is a sin that hardens the heart and causes laziness in worship.