sentences:  "Ab 18" includes, among other things, the songs "Geschwisterliebe" and "Claudia hat 'nen Schäferhund" which were indexed at the time of the release of the album and "Schlaflied".Another previously released song on the record was "Sweet Sweet Gwendoline", which already appeared on "Die Ärzte" and was not indexed.However, it was controversial because of the glorification of sadomasochism.