Not only did the original "underwear bomber" Abdullah Hassan al-Asiri hide explosives in his rectum to assassinate Saudi Prince Muhammad bin Nayef—they met in 2009 after the 22-year-old holy warrior "feigned repentance for his jihadi views"—but al-Asiri apparently had fellow jihadis repeatedly sodomize him to "widen" his anus in order to accommodate the explosives— all in accordance with the fatwas [religious edicts] of Islamic clerics.
A 2010 Arabic news video that is making the rounds on the Internet gives the details. Apparently a cleric, one Abu al-Dema al-Qasab, informed jihadis of an "innovative and unprecedented way to execute martyrdom operations: place explosive capsules in your anus. However, to undertake this jihadi approach you must agree to be sodomized for a while to widen your anus so it can hold the explosives."
Others inquired further by asking for formal fatwas. Citing his desire for "martyrdom and the virgins of paradise," one jihadi, (possibly al-Asiri himself) asked another sheikh, "Is it permissible for me to let one of the jihadi brothers sodomize me to widen my anus if the intention is good?"