Reference: Fataawa Ramadhaan – Volume 2, Page 618, Fatwa No. 617
Fataawa as-Siyaam libni-Jibreen – Page 70
Question: Concerning the one who had anal sexual intercourse with his wife during the day in Ramadhaan, does he have to make an expiation?
Response: It is obligatory to make expiation for sexual intercourse whether it is from the vagina or the anus.
Important note: Anal sexual intercourse is Haraam in Islaam, and this fatwa does not in any way or form imply it’s permissibility or acceptance.