Desire Dungeon

You're a travelling adventurer who, one day, hears a strange rumour in a tavern. A rumour about a dungeon that will grant all of your desires, should you manage to reach the bottom.

Intrigued, you search for and succeed in finding the dungeon. An entire town is built on top of it, populated by oddly-friendly townsfolk. You learn that the dungeon is inhabited by alluring monster girls who attack adventurers for their semen.

Desire Dungeon is a H-game released by developer Tower of Desire in 2012.

Tropes used in Desire Dungeon include:

Blob Monster: The Slime. She is too slow to attack normally, instead creating copies that trap anyone that attacks them.
Blow You Away: The Fairy fights using wind magic, including Razor Wind.
Chest Monster: The Mimic, who randomly appears as the trap in a chest dropped by any monster. She is the manager of the dungeon's chests and punishes adventurers who aren't able to disarm them. For some reason, she's dressed as a Miko.
Counter Attack: The Counter skill causes you to parry the enemy's attack and unleash an attack of your own.
Cute Monster Girl: Of all shapes and sizes. They inhabit the dungeon and attack passing adventurers for their semen, which results in a level being drained. However, they let them go afterwards.
Dungeon Crawling: The focus of the game is exploring the eponymous dungeon. You randomly encounter enemies or other events as you move between floors, and the enemies naturally get tougher the deeper you go.
An Economy Is You: The only buildings in the town that you can visit are the inn, the shop, the temple and the bar.
Enemy Scan: Wild Sense, a passive ability learned from the Werewolf, allows you to see the enemy's HP and MP (and also improves Thief skill).
Harping on About Harpies: The Harpy, who has magical entrancing songs similar to a siren.
Hit Points: Interestingly, both HP and MP act as this. HP is depleted by physical and magical attacks, MP by erotic attacks.
Horny Devils: The Lilim and the Succubus.
Inexplicable Treasure Chest: All enemies drop loot in the form of a treasure chest, if beaten by normal attacks. Said chest always contains a trap which you must disarm to get at the contents.
Lamia: Ouroboros, the final boss and protector of the dungeon. She has horns and small draconic wings in addition to a serpentine lower half.
Level Drain: Losing to any enemy causes them to rape you and drain one level.
Lizard Folk: The Dragon Newt, similar to the other monster girls, is human aside from her small horns and lizard tail.
Mana Meter: MP, representing willpower. It is consumed by using skills, as in other games, but it also gets depleted by erotic attacks.
Master of Unlocking: The player character grows into one. They can disarm trapped chests through a simple minigame involving inputting a random sequence of left and right mouse clicks. Success is affected by Thief skill, which can be raised using equipment or certain skills. Each level of Thief skill reveals one part of the sequence.
Muscles Are Meaningless: The monster girls cheerfully flout the basic laws of biology. The Fighter and Dragon Newt are physical powerhouses despite being just as slender as the rest.
Non-Lethal KO: Every fight ends this way. If you defeat an enemy by conventional attacks, they run away. If you defeat them by erotic attacks, you have sex with them. If they defeat you, they rape you (draining a level) and then let you go.
Our Fairies Are Different: The Fairy is the first and weakest enemy encountered. She's portrayed as an innocent Little Sister Heroine
Our Werewolves Are Different: The Werewolf, who doesn't seem to transform between two shapes but instead is always part-wolf. She has some canine mannerisms such as scratching herself.
Our Vampires Are Different: The Vampire drains life energy through her kiss, rather than blood. Like other monster girls in the game, she doesn't kill her victims.
Randomly Drops: All enemies drop a treasure chest if defeated by conventional attacks, and the contents of the chest are random.
Trauma Inn: And unlike the usual video game inn, this one is completely free!
Unskilled But Strong: The Dragon Newt is physically powerful, but her lack of formal training means that her attacks are easily dodged.
Vendor Trash: After you obtain an item for the first time, any others you get become Vendor Trash and are automatically sold for gold at the shop.
Victor Gains Loser's Powers: Skills are learned by defeating enemies using erotic attacks, which causes them to teach you one of their skills.