No, I was being facetious about the sexy thing because clearly sex sells to many humans, not simply Sensor types, and in fact sex might sell more readily to an adventurous ENFP looking for shiny things, or an Se-driven ENTJ than an ISFJ who ties his sexuality extremely closely to his or her religious beliefs (not saying that all ENFPs, ENTJs, or ISFJs are like that, just saying this is very much a possibility with the various types).
I don't see what is necessarily S about Katy Perry if you don't mean her extremely sexualized image. Do you mean that she plays popular music?
We could argue all day about music...or rather *I* could argue all day about music. What about the ISFPs who elevate music to a complex art form of sound? What about the ISTJs who think that classical music is better than anything that could possibly be played on the radio?
It's true that we can stereotype INTx, for example, playing extremely technical, industrial, electronic "experimental" music (I know stereotypical INTP music when I hear it, it hardly even sounds like music but like some electronic, intellectually pretentious jerk-off session) ....but anyway some of the biggest music snobs I've known have been Sensors. It's not a Sensor thing to prefer popular music.
Simulated World, an ENTP musician and music teacher, believes that popular music is an extremely valid form of music and is in the process of producing a pop album (or may have already done so, just by last time I talked to him). I was also conversing with an INFP on this site just yesterday, where I was extolling the virtues of musically complex guitar solos in classic rock, and he admitted his favorite kind of music is R&B and pop.
I also like pop myself, I actually have very eclectic taste in music, and listen to everything from Mozart to Duran Duran to Bob Seger to Tori Amos to Dead Mou5. I also think a couple of Katy Perry songs are catchy.
We can say that some people only listen to simplistic pop, but is it because they're Sensors, or just because they're people who aren't big into music so never delved too deeply into it and just turn on the radio occasionally or go out to dance clubs sometimes. Is it just because they aren't musically inclined, not because they're a certain personality type?
EDIT: Actually ignore the intelligence argument that's not a good argument, because since there are many types of intelligence (and Musical intelligence is in my top two) it's possible that Musical is the lowest for some people, just like Mathematical is pretty damn low for me. Maybe basic pop is to those people what basic math is to me...necessary or even pleasant to have (I'm actually quite good at counting and handling money, I always had impeccable drawers when I cashiered and carried large amounts of cash both as a waitress and a dancer) ...but not so good at the more complex stuff. Like I hate Algebra. They just have no interest in anything that goes beyond "catchy" or "makes me feel happy." And that's okay. It just means music isn't one of their top priorities or skills.
Popular music is popular because something about it appeals to most humans. Not because they're Sensors, but because it's catchy, I think. There's something to it, perhaps a formula, that simply appeals to the human ear/brain.