The Messenger of Allaah (sallal-laahu alayhi wasallam) said:

”Cursed is he who approaches a woman (i.e. his wife) in the anus.” [1]

The messenger (sallal-laahu- alayhi wasallam) said:

”Indeed Allah is not shy of the truth.  Do not have intercourse with women (i.e. your wives) in their anuses.” [2]

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[1]Reported by Imaam Ahmad 2/479.Saheeh al Jaami no: 5865

[2] Reported by Imam Nasaa-ee, Ibn Maajah and others. Authenticated by Imaam Al Albaanee in Saheeh al Jaami No: 933, 934, 1852, 7711