The site offers five chat rooms in different languages, and by looking through the backlog there seems to have been plenty of face-to-face hook-ups.
It appears to have been online since 2007, but has only started making headlines after attacking the Catholic Church.
The necropolis was not originally one of the underground Catacombs of Rome, but an open air cemetery with tombs and mausolea.
Before its walls are portrayed the donors (identified by a text): the abbess Costanza and the nun Benedetta.
The Vatican Necropolis lies under the Vatican City, at depths varying between 5–12 meters below Saint Peter's Basilica.
Renowned journalist Vittorio Messori wrote an article in an Italian newspaper this week, outing the website.
On the website, it posted a manipulated picture showing Pope Francis with cardinals dressed as the Village People.