If someone intentionally engages in sexual intercourse during the day in Ramadan, they are required to pay kaffarah in the following order:
1. Freeing a slave (no longer applicable today)
2. Fasting for two consecutive months
3. If unable, feeding 60 poor people
Reference (Hadith): “A man came to the Prophet Muhammad (peace be upon him) and said: O Messenger of Allah, I am ruined! The Prophet asked: What happened? The man replied: I had intercourse with my wife during the day in Ramadan. The Prophet said: You must free a slave. The man said: I cannot afford it. The Prophet said: Then you must fast for two consecutive months. The man said: I cannot do that either. The Prophet said: Then you must feed 60 poor people.” (Narrated by Bukhari & Muslim)