I don't understand why terms like "shock value" keep getting tossed around. Of course Nicki is gonna shake her ass in "Anaconda"...have you heard the song?! Was she supposed to rap "d*ck bigger than a tower, I ain't talkin' bout Eiffels" wearing a burqa? The video went viral and everybody watched it. That's why she still holds the record.
Besides, what's wrong with using your sex appeal when rapping a sexual song?

I mean Nicki used her assets in the same way Taylor used her roledex to get her 40 celebrity friends to make 0.5 second cameos.