Is it permissible for a Muslim man who has married a Christian woman in a mut'ah marriage to have intercourse with her if that is stipulated in the contract, and what are the limits of permissibility in a mut'ah marriage?

Mut'ah marriage (temporary marriage) is Haram (forbidden) in Islamic Sharia by consensus, and its prohibition has been established until the Day of Judgment, as indicated by authentic hadiths. The man who claimed its permissibility is either a wicked Rafidi (Shiite), a deviant Muslim, or ignorant.