The Fox TV Network has picked out an advertiser niche and is aiming squarely for it. It is the 18-34 Male demo, which usually brings along a sizeable amount of 18-34 females as well. All the other broadcast networks are aiming at 25-54 females, a completely different animal.
To hit a big chunk of 18-34's, you play to (lamentably) their frat-house entertainment tastes. Of course, once in a while Fox will hit on a crossover phonom, like it did with "Joe Millionaire" - which, amazingly is coming back with a second guy and a second group of "girls-that-don't-know" - but, for the most part, they aim 18-34 and deliver. You're not going to lock in most 18-34 viewers with La Boheme.
Michael