Strange Decorum

Everyone is quoting this example of Bush getting naughty:

Speaking of George Bush, with whom Sharon developed a very close relationship, Uri Dan recalls that Sharon's delicacy made him reluctant to repeat what the president had told him when they discussed Osama bin Laden. Finally he relented. And here is what the leader of the Western world, valiant warrior in the battle of cultures, promised to do to bin Laden if he caught him: "I will screw him in the ass!"

To try and make a novel point about this, why wouldn't Bush say he wants to "fuck" OBL in the ass? It strikes me as strange to get fastidious about the terminology used to express the rape fantasy as long as you're going to express the fantasy. I had a similar thought yesterday's watching Cradle 2 The Grave (truly the poor man's Romeo Must Die) on TNT where it was okay to show giant gun battles, a woman performing a striptease to distract a guy while her colleagues break into his office, etc., but everyone had to say "freak" instead of "fuck." What does this accomplish? Meanwhile, there were an awful lot of ads for K-Y Jelly running during commercial breaks which seem much more likely to me to generate a situation that will make parents uncomfortable ("daddy, what's a lubricant for?") than would the occassional dirty word.