The original CBS news report says the would-be assassin was in the company of his target's bodyguards for 30 hours at the Saudi palace before he detonated his bomb trying to kill the prince.
As a gay man, I have occasionally experimented with modest sized butt plugs. I can also tell you that after just a few hours, the urge to expel them becomes overwhelming and uncontrollable, if only for the natural gas produced by the intestines.
Unless the suicide bomber had inside help who hid the bomb in the palace where the assassin could find it and insert it in private before his attack, which there has been absolutely no report of that I can find, then the bomber had it inside him for more than 30 hours.
This suggests to me that after the bomb was inserted in his rectum that a sympathetic doctor sutured his anus closed to prevent it from being forced out by the body involuntarily.
If this turns out to be the case, then it would tend to eliminate the scenario many have proposed where a lone suicide bomber boards an airplane with a large explosive concealed in his rectum, expels it in the plane's bathroom, then detonates it where it causes an explosive decompression because it would have to be stitched up inside him to keep it in.
On the other hand, a group of terrorists working in concert could insert small bomb components rectally in the airport terminal and then take turns expelling them in the plane's bathroom once it became airborne, to be assembled into a large bomb by the carrier of the last component.
Similarly, a group of terrorists working in concert could conceivably use easily obtainable urinary catheters to fill their bladders with liquids that could be used to make an explosive device. If left inserted, the catheters could be clamped to prevent discharge until they got into the plane's restroom, whereupon the chemical(s) would be expelled and collected in private, to be combined by the last terrorist in line for the john.
So it seems to me that the best way to thwart this latest tactic is NOT to confiscate everyone's shampoo bottles and do a body cavity strip search before everyone gets on the plane, but to station an armed air marshal in every restroom on every plane to make sure nothing unnatural comes out of any users' orifices. That way, if you go before you leave and can hold it until you land, you won't be inconvenienced.