PLoS One 2010, 5, e14150. No one particular component will cause sexual dependancy, but there are assumed to be biological, psychological, and social factors that add to the enhancement of these ailments. One of these horses manifests as a vengeful spirit and possesses him. 76. Impett, E.A. Strachman, A. Finkel, E.J. Gable, S.L. 75. Muise, A. Impett, E.A. Desmarais, S.