What is the ruling on anal sex with one's wife using a condom for pleasure and intercourse, and what is the expiation for it?

It is absolutely impermissible to engage in anal intercourse with one's wife, whether with or without a condom, due to the generality of the hadiths that prohibit it. Among them is the saying of the Prophet, peace and blessings be upon him: "Accursed is he who has intercourse with his wife in her anus." The prohibition is not limited to avoiding impurity but includes other reasons as well.