Everything that a fasting person does from the invalidators – eating, drinking, or sexual intercourse – with complete desire and intention, deliberately and not under coercion or necessity, and not due to a legitimate reason for breaking the fast: such as menstruation, illness not caused by him, or any doubt, necessitates expiation. All the invalidators of fasting for which expiation is not required, expiation is obligatory for them; to deter him if it is repeated from one time to another; due to the intention of sin. Refer to Bada'i' al-Sana'i 2: 97-98; narrated by Abu Huraira (may Allah be pleased with him), who said: "A man came to the Prophet (peace be upon him) and said: I have destroyed myself, O Messenger of Allah. The Prophet asked: What has destroyed you? He said: I had sexual relations with my wife during Ramadan. The Prophet asked: Do you find something to free a slave? He said: No. The Prophet asked: Can you fast for two consecutive months? He said: No. The Prophet asked: Can you feed sixty poor people? He said: No. Then he sat down, and the Prophet was brought a large basket containing dates. He said: Give this in charity. The man replied: We are poorer than those who are between the two lava plains. The Prophet laughed until his molars showed, then said: Go and feed your family with it." This is in Sahih Muslim 2: 781, and Sahih al-Bukhari 2: 684. And from Abu Huraira (may Allah be pleased with him): "The Prophet (peace be upon him) commanded a man who broke his fast in Ramadan to free a slave or fast for two months or feed sixty poor people." This is in Sahih Muslim 2: 782.