I'm susceptible to that sort of thing - to walls and flowers. You can probably get something more from a wall than a person sometimes. It's just put somewhere.
Obsessional does not necessarily mean sexual obsession, not even obsession for this, or for that in particular; to be an obsessional means to find oneself caught in a mechanism, in a trap increasingly demanding and endless.
For fossils to thrive, certain favorable circumstances are required. First of all, of course, remnants of life have to be there. These then need to be washed over with water as soon as possible, so that the bones are covered with a layer of sediment.