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As per the website "Sex in Christ":

 Fisting and God's Will
The sex act called fisting is a source of confusion and misconceptions for many Christians. This is unfortunate, because it means that many Christian men and women are depriving themselves of what could be the most spiritual sexual experience of their lives. Like anal sex and BDSM, fisting is often mistakenly associated with the gay community or is considered a sex act too extreme to be appropriate for Christian couples. Not only are these views incorrect, but fisting actually has a scriptural precedent, as we will show.