Reference: Fataawa Ramadhaan – Volume 2, Page 606, Fatwa No.597
Fataawa Shaykh Ibn ‘Uthaymeen – Volume 1, Pages 541-542
Question: What is the ruling regarding one who had sexual intercourse with his wife during the day in Ramadhaan?
Response: If they were [both] from those upon whom fasting was not obligatory, for example, they were travelling, then there is no harm in this even if they were both fasting. However, if they were [both] from those upon whom fasting is obligatory, then it is haraam upon them and they are required to make up the fast for that day. In addition, they are to free a slave and if they are unable to do this, then to fast two consecutive months and if they are unable to do so, then to feed sixty poor and needy people. [Notice] the [same is required of the] wife as is [required of] her husband, if she freely consented [to having sexual intercourse]. However, if she was forced, then nothing is required of her.