Trials of the Monster Labyrinth Series

The Ecstasy Series (or エロゲシリーズ Erogeshirīzu, lit. Eroge Series in Japanese releases) are, as the title suggests, a series of Japanese pornographic video games, which are, of course, released exclusively as PC games.

Basics/Layout
The Eroge Series is similar to Climactic Life wherein the controlled character engages sexual activities with the subject. Unlike Climactic Life, however, the player cannot create a character, herein the character is already pre-made. Also, the game is a text-based adventure genre mostly filled with non-human characters, or animals, while including pre-rendered scenes.

List of games
These are the games that are part of this seres. They all have "Ecstasy Series" or "Eroge Series" at the beginning.
 * Legend of the Dragon (JP) / Dragon (Int)
 * A Dane Covered in White (JP) / Canine (Int)
 * Jungle Fever (JP) / Lion (Int)
 * Tyrannosaurus Sex (JP) / Dinosaur (Int)