What should one do who watched pornographic films in Ramadan and semen was discharged, and he repented, but he does not remember the number of days he broke his fast, and must he make up these days before the coming Ramadan? And what is the ruling if the coming Ramadan arrives and he was not able to make up the days?

All praise is due to Allah for bestowing upon you the grace of repentance. The fast of one from whom semen is discharged due to looking at haram (definition) pictures or films is invalid and must be made up. If you cannot precisely determine the number of days, continue making up the fasts until you are certain that your obligation has been fulfilled. It is obligatory to make up these days before the next Ramadan (definition). If you intentionally delay, you must repent and offer an expiation for each day, amounting to 750 grams of the staple food of the people of your country.