After realising a sonic composition with porno-actors’ orgasms, the artist has caught the public transports by which she uses to move daily in London, while listening at this recording at the highest volume; her private listening has thus become public. With the same material, the artist has realised a kit in mp3, equipped with earplug headphones and users’ directions, inviting then the audience to perform her action, i.e. to walk through a usual urban trajectory and sonically contaminate the environment.