Stygiophilia describes sexual arousal at the thought of hellfire or damnation. The term comes from a combination of the word Stygian, an adjective describing anything pertaining to the River Styx (the River of Hell), and philia, meaning love.
Stygiophilia is also sometimes known by its Latinized name, Hadephilia, after the Greek God of the Underworld, Hades. It is sometimes spelled Stigiophilia.
Kinkly explains Stygiophilia
Stygiophiles are attracted to kinky, "sinful" sex which they believe will send them to Hell. It’s the thought of damnation, rather than the sex itself, that really turns them on. They may also be turned on by the idea of being surrounded by heat and flames. Many stygiophiles express their preferences through artworks of sexual acts taking place in Hell, which they may post online.
Stygiophilia is closely related to pecattiphilia, which is sexual arousal inspired by commitment of sins and feelings of guilt.