Even in the US, nude art is not per se sexual harassment. Most workplaces will ban (non-work-related) nude art as part of an effort to create a massive buffer space around potential liability (among other reasons that don’t rely on it necessarily being sexual harassment), in part because the US has an unusually pro-initiation-of-litigation legal system (for instance, having a very high bar beyond merely losing before the loser of litigation is ordered to pay the winners legal fees.)

(There’s a weird sort of positive feedback loop where, despite distance from the law, people subjected to sexual harassment trainings in which employers, etc., imply that everything within the wide buffer space around liability that they are trying to create is “harassment” drives, if not the law, the public understanding of harassment, leading to pressure to expand the effective workplace definition further to create a buffer space around not only actual liability but the things people are likely to understand as harassment.)