After the second album they parted ways with Sahnie due to internal problems. He was replaced by producer Manne Praeker on the third album. Later "The Incredible Hagen" played bass for them until their breakup, although he never became an official member of the band. The third album was also the first time that Farin used distorted guitar sounds on most of the album, moving the band's sound towards rock. In 1987 the German Federal Centre for Media Harmful to Young Persons put the songs "Geschwisterliebe" ("Sibling love", a song about incest, from the eponymous album Die Ärzte), "Claudia hat 'nen Schäferhund" ("Claudia has a German shepherd", about zoophilia, from Debil) and "Schlaflied" ("Lullaby", about a monster coming and eating its victim after falling asleep, also from Debil) on the German List of Media Harmful to Young People (often called "the Index"). This prohibited the band from performing the songs live or promoting the two albums and, more importantly, shops were prohibited from openly displaying these records on their shelves. At their concerts they circumvented the ban by playing only the music of the prohibited songs, while the audience sang the lyrics. After several trials against shops that still openly sold the records, a lot of shops completely removed Die Ärzte from their stock. The result was a drop in record sales and financial problems for the band. In response they released the best of album Ist das alles? ("Is that all?") with three new songs and the 10" compilation Ab 18 (Adults only) containing all indexed songs and some other songs with controversial, mainly sex-themed lyrics. Although advice not to sell the album to minors was printed on the cover, Ab 18 was also put on the index.