All it is is marketing; and, if you buy into it, you're supporting it: You're supporting the objectification of women. I don't care about Miley Cyrus. I don't care about twerking. I'm dumbfounded by the people who try to create controversy out of what she does. IT'S MARKETING! Let her do what she does. IGNORE HER. If you talk about it, even against it, you're supporting it. That's what "they" want. (Now, forget you read that because I don't want to be a part of the segment of the population who contributes to her popularity, both negative and positive.)
And while I'm ranting here.... When I was a kid, Halloween was about scary costumes; it wasn't about sexualizing 5-year-old girls. We made our own costumes. We were monsters, witches, devils; we were whatever we wanted to be. It's one thing if an adult woman chooses to be a "sexy devil"; it's quite another when costumes aimed at elementary school-aged children markedly indicate a difference between the devil costume for a boy and a (usually "sexy") devil costume for a girl. Then, there's this: Boy Pterodactyl Costume.
Make your own choices, follow your own instincts, BE CREATIVE, and, for crying out loud, don't let chauvinistic marketing ploys win (even better, don't let consumerism win--see the "BE CREATIVE" part above).
There, I think I"m done for now.