Brian C. Stowe faces more than 400 years in prison after police found images and videos of the women on his computer.
Police arrested Stowe after a 17-year-old girl reported he drugged and sexually assaulted her as she lay unconscious in bed in October 2012. Stowe was sentenced in January to the minimum 15 years in that case.
Police widened the investigation after the girl came forward. None of the women knew Stowe took images of them while they were unconscious.
Stowe has been charged with 62 felonies.