[Private]
Near as I can tell, it has something to do with the fact that they spend all day reading people's behavior and said people are not exactly individuals with clean and wholesome thoughts, plus looking at their, uh, handiwork. I mean, it has to be super icky. They pretty much turn things off to get the job done, hence one reason I shamelessly flirt and showboat when they call me, see if I can get them to smile for a sec.
...Also, half the time I feel like it's a contest with the other profilers, see how well they can read each other. Definitely seen them guessing a few times.