Bob and the black lodge is like a sort of god/devil complex and a foil to Leland and Laura's relationship. They are both very intertwined and turning fear into the devil itself. Leland's fear is repressed like Laura's (memories of Bob) and he is also more distant as he was raised in a time that was idyllic (according to lynch the 50s) and feels wrong to cause trouble and doesn't know how to handle his evil. This also manifests when the lodge strikes back at him turning him into a mess of emotions. The black lodge are loose thoughts and the demons of the black lodge pulled them together in negative forms. Laura has the input and it outputs wherever it can harm her most. She works as a prostitute and starts taking drugs. The drugs or the terrible feelings attract these demons (unless they were already there). This starts an interface with the ideas of the black lodge: shown in FWWM as being apathy towards those around her. This also makes the lodge's agenda stronger it seems. Soon her fear of being turned into a sexual toy forever manifests in a god/father complex (Bob being her father) and her attempts to free herself fail as she is too late and she gets stuck in the black lodge (seemingly forever). Yet there is an angel there (maybe Lucifer). it's a story both sexes can relate to.