According to Cosmopolitan magazine, Jackman was terrified to film the scene with co-star Rachel Weisz, because her fiance was behind the camera in the director’s chair.
The X-Men star had to film a love scene with Weisz in the bath, while director Darren Aronofsky was watching. Jackman said, "In the scene, she pulls me in the bath and we start kissing. Darren didn’t shout: ‘Cut,’ so we kept kissing. Rachel started to take off my shirt and I was thinking: ‘Shall we keep going?"
Apparently so, because Aronofsky then shouted, "Take off his pants!"