Exhibitionism is increased by taking durability damage.
Libido by lust damage.
Masochism by normal damage.
Corruption is increased by wearing cursed items.
Viewing post in Ero Dungeons [Old Version] comments
OOooooooo
Okay, that makes a lot more sense and explains why certain party members have higher levels than others (masochism must be SLOW then, because I've had a Prisoner tank the majority of the damage in multiple dungeons back-to-back with minimal increase to the bar).
Thank you for the clarification!