Thomas was arrested again for being a "Peeping Tom." He frequently takes his binoculars, walks around his neighborhood at night, and tries to watch people as they undress and prepare for bed. He finds this watching behavior sexually stimulating and feels that this innocent behavior does not hurt anybody. What is his likely diagnosis?
a) Frotteuristic Disorder
b) Exhibitionistic Disorder
c) Sexual Masochism
d) Voyeuristic Disorder