According to the Japanese Wikipedia, a version with genital censorship and an R18 sticker on the package was rereleased to cope with the pornography regulation toughened after the Saori Incident dated Nov 25 1991. Wikipedia: https://ja.wikipedia.org/wiki/%E3%81%8D%E3%82%83%E3%82%93%E3%81%8D%E3%82%83%E3%82%93%E3%83%90%E3%83%8B%E3%83%BC%E3%82%B7%E3%83%AA%E3%83%BC%E3%82%BA