If Sigur Ros' new video were a movie, it might merit an adults-only rating.
For the band's clip of Fjogur Piano, released on Monday, Transformers star Shia LaBeouf appears naked.
Alma Har'el directed the video, which is part of a series being created for the band's latest album Valtari.
The nude scenes featuring a bearded Shia and actress Denna Thomsen weren't pre-planned, but came out of group consensus during the five-day project.
"To me, it's erotic, but it's not selling anything. That's the difference between working within a corporate system and something that artistically takes you places you wouldn't expect," the Israeli filmmaker told the Wall Street Journal.
"The things you can't say in words are best said in dance," she added.
The video also features female nudity, dancing, an octopus, lollipops and trippy images.
Band bassist Georg Holm said the director and Shia collaborated on the idea for it, and described it as "absolutely amazing".
Videos don't come with ratings, but the Sigur Ros video does have a warning for its content before it begins.