Since Sienna Miller helped him publicy establish his heterosexuality last year, heartthrob Hayden Christensen must feel comfortable letting it all hang out in his new movie Factory Girl. In fact, he may be letting more hang out than he realized at the time during his sex scene with Sienna. It’s unclear whether it’s his ball sack, the underside of his penis, or just a nude-colored thong, but it’s certainly enough to get the imagine working. Decide for yourself after the jump [NSFW].