I'm saying that it was merely an element of her show.
This is a whole other discussion in itself, but here are a few brief thoughts.
There are certain deep hard-wired responses in the human brain. Sex is one. The cuteness response is another (I first became aware of this one reading A Biological Homage to Mickey Mouse by Stephen Jay Gould--btw, that's a PDF link--as I was looking into primary presuasion attraction elements).
The thing about these deep responses is that if you shine the spotlight on them, they tend to be the focus of the impact of the display, thus they rob the effectivelness of the other elements. At the very least, they weaken the public's attention on everything around them.
Primal reactions are extremely easy on the conceptual mind--note, effective primal prompts are easy-peasy to produce, i.e., make it round and cuddly for cute, take your clothes off for sex--and they hog the emotional responses of any item or presentation that bears them. This is something I believe Ayn Rand felt, but could not articulate other than have Roark throw the damn baby sculpture against a wall within the context of Mallory's artistic potential.
Granted, different people have different degrees of sexual responsiveness, but mirror neurons are mirror neurons and the human race as a whole is highly motivated by sex. If you highlight it among other elements (when no other primal reaction designs to prompt cuteness, terror, etc. are present), sex is what people are going to resond to first and most.
I'll even grant you that the Puritanism you object to increases the focus on sex by making some people feel it's nasty. But that does not remove sex from its priority role in displays like that halftime presentation and make it equal to everything else.
This is a reason I believe sex appeal was a main element--if not the main element--in Beyoncé's show. Further, I believe she and her managers knew it and did it on purpose. Of course there were other ingedients, ones that demanded expert skills, and I'm sure the musicians and lighting people were not flattered by being second string to sex, but human resonse is what it is.
Beyoncé simply took the easy way out in wowing the public.