Praise be to Allah, the Lord of the Worlds; and blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.
Almighty Allah has forbidden sexual intercourse with wife in her anus. Allah says in the Holy Quran:{Your wives are a tilth for you, so go to your tilth (have sexual relations with your wives in any manner as long as it is in the vagina and not in the anus}. When woman is tilth so intercourse should be in vagina not in the anus. The Prophet (Blessings and peace of Allah be upon Him) also said: "The one who has intercourse with a menstruating woman, or with a woman in her rectum, or who goes to a fortune-teller, has disbelieved in what was revealed to Muhammad." Allah feels no shame of saying the truth. Don’t search the pleasure in a woman’s rectum. We advise the questioner to turn to Allah in repentance and seek forgiveness, and determine not to return to the sin. Allah knows best.