Justin Bieber performed his new single "Boyfriend" for the first time on last night's season finale of The Voice. The tune, his sexiest yet, is basically a blend of the Ying Yang Twins' creepy classic "Wait (The Whisper Song)" and, well, pretty much anything by Justin Timberlake circa FutureSex/LoveSounds. Weirdly, Bieber seems a lot more enthusiastic about fondue than girls in this performance, which suggests that maybe he's not quite ready to sell this type of sexuality. Teen girls everywhere will probably disagree about that, though.