Robin Thicke is currently number one, mostly on the strength of a video with topless women in it.
But it's okay, because it's art, he tells Metro:
Is it acceptable to objectify women in pop videos? If it’s acceptable to ‘objectify’ women in the Louvre… People have been painting and sculpting naked women since the beginning of time. We didn’t objectify them, we just showed them in their most natural state.That's right, women. Your natural state is with your tits out writhing next to a so-so singer.