Mamuldeulgwa Dungeon-e Gatyeotda

Shelviet is left all alone from the monster subjugation team, facing the threat of death by the Demon Kings. Just as the Demon Kings are about to kill her and head home, a mysterious status window pops up.

[The cave will remain sealed forever until you lewdly copulate with the human female.]
[Current lewdness: 0%]

There's no way out of the dungeon unless we 'lewdly copulate'?

"Hey, you. Are you good at 'that'?"

Wait, are these monsters by any chance virgins?

Original Webtoon:
Lezhin, Bomtoon