There's nothing like getting a massage. It relieves pain, reduces stress, and is a truly enjoyable experience...but imagine having your trust betrayed by your masseuse.

Daniel Hines was a licensed massage therapist who hid a camera in his massage establishment to catch his female clients undressing.

"I paid him money to take advantage of me," Jillian Phillips tells INSIDE EDITION.

Phillips regularly received massages from Hines after competing in roller derby matches. She says Hines was very good at making the soreness go away, but she was shocked when she found out he had been secretly taping her while undressed. And she wasn't the only one; more than 100 other customers appeared in his perverted collection of videotapes.
 
"I take myself to be a pretty good judge of character and I was absolutely fooled," admits Phillips.

Lieutenant Mike Metcalf of the Stillwater, Oklahoma, police department showed INSIDE EDITION how Hines placed a small camera inside a black sock and made a hole for the lens: "[He] just [used] a black sock, but he took black tape to tape over it to cover the silver, so the only thing exposed was the lens."

Hines pleaded guilty to 114 counts of unlawful use of videotaping equipment and no contest to four counts of sexual battery and one count of attempted sexual battery. He is serving a five-year prison term.

And this was not an isolated incident, an INSIDE EDITION investigation has found hundreds of women across the country have been secretly videotaped while undressing in what they thought were private massage treatment rooms.

And Barbara Terry from West Virginia was horrified when she found out Richard Filbin, a licensed massage therapist she visited twice a month for years, had been secretly taping her. She never had a clue.

"I felt violated, defiled, disgusted and physically ill," Terry says.

When police arrested Filbin they say he had taped more than 100 clients over a five-year period. Filbin pleaded guilty to 12 counts of criminal invasion of privacy and was sentenced to two years probation.

Phillips and Terry say the say their experiences have left them paranoid, always wondering who may be watching them in their most private moments.

The American Massage Therapy Association says while these cases of abuse are rare, even a few are too many. They say look for well-established, licensed massage therapists and try to get a referral from someone you trust.