Shia LaBeouf discusses his nudity in Sigur Ros music video

(CBS/AP) LOS ANGELES - Just because Shia LaBeouf appeared completely nude in a recent music video and has said he's willing to perform real sex acts in Lars Von Trier's upcoming film "The Nymphomaniac," doesn't mean he's going through an exhibitionist phase.

The 26-year-old actor says he's "not choosing to be naked all the time" and that he "didn't get into (acting) to be a porn guy."

Pictures: Shia LaBeouf
Read more: Shia LaBeouf strips down in new Sigur Ros video

"We were just playing characters," he explained, according to the Associated Press.

Still, the eight-and-a-half-minute music video for Icelandic band Sigur Ros' song "Fjogur Piano" shows the "Transformers" star naked and caressing the bare breasts of his female co-star. He said people have been responding well to the video so he feels "quite confident" about his performance.

LaBeouf does not get naked in "Lawless," opening Wednesday, about a West Virginia moonshine business during the Prohibition era. The film also stars Jessica Chastain, Tom Hardy and Guy Pearce.