Earlier this month, three out of the top ten pop songs in the U.S. feature the F-bomb - not just in their lyrics, but in their titles. The artists are Cee-Lo, Pink, and Enrique Iglesias and the songs are called "F You", "F-ing Perfect", and "Tonight I'm F-ing You." We spoke to Peter Silverton, author of "Filthy English: The How, Why, When, & What of Everday Swearing" about rude words in music.