For most of the 20th century, popular media aimed for the lowest common denominator. The "four-quadrant movie" (appealing to men, women, old, and young) was the holy grail. That era is over.
Titles like these often indicate the content involves explicit material, and they might be organized into episodes or parts, as suggested by "Part 1". The specifics, such as "CzechStreets", "E138", "Horny", and "PE.Teacher", could imply the setting, episode number, a character's trait, and a profession or role within the content, respectively. CzechStreets.E138.Part.1.Horny.PE.Teacher.XXX.1...