The Playboy picture likely counts as objectification but seems like a terrible example. I'd illustrate it using someone keeping women around as status symbols. And note that it matters little for our purpose if one makes the women wear skimpy clothing like Hugh Hefner does -- giving them curfews and rules against dating so as not to embarrass the old man -- or puts them all in burqas. By contrast, finding a women attractive in part because she wants to have sex seems very far from objectification. (Technically I believe making a women sincerely beg for sex can never count, though it might fall under a different offense.)

I mention this because I saw commenters saying that men want to feel more objectification, and this seems false almost by definition. Men want more sexual attention that respects their wishes. Maybe someone with more time or smarts to spare can link this with the status discussion in an interesting way.