Ruling concerning anal intercourse
Question: A man asked his wife to have anal intercourse with him. Is this acceptable behavior from the point of view of the religion?
Response: That is an evil act. Abu Daawood, an-Nasaa.ee and others record with a good chain that the Prophet (sal-Allaahu `alayhe wa sallam) said:
((Accursed is the one who has anal intercourse with his wife)).
Shaykh Ibn 'Uthaymeen