Ikenie ~Kyouraku no Shinden~

This short game has a rather cryptic plot. The identity of the hero is unclear: we know only that he is a young male, most probably living in our time. One day he is resting after having had sex with a girl, and is mysteriously transported into a strange temple. Without knowing what this temple is, and only presuming it must be built by the Aztecs of Yucatan, the hero must find a way out of it, and back home.

[From Moby Games]