WARNING: This story contains graphic details

ST. JOHN'S, N.L. -- A forensic psychiatrist says a child-size sex doll at the heart of a trial in St. John's, N.L., meets the definition of child pornography.

Dr. Peter Collins testified in provincial court Tuesday that the doll is the size of a prepubescent child without sexually mature characteristics.

Collins said the doll was advertised for sexual use and is anatomically incorrect in that its vaginal opening is large enough for a man's erect penis.

He said such items appeal to "pedophiliac subculture" and are meant "to be fantasized as a prepubescent child."

Kenneth Harrisson, 51, of St. John's has pleaded not guilty to charges of possessing child pornography and mailing obscene matter.

He also faces two charges under the federal Customs Act of smuggling and possession of prohibited goods.

The doll was on its way to St. John's from Japan in 2013 when the Canada Border Services Agency intercepted it.

Key issues include whether the case constitutes child pornography if no actual child was involved.

It also raises the limits of free expression.

Collins testified as an expert witness and also quoted research by Michael Seto, a Canadian forensic psychologist who focuses on pedophilia.

Collins said some pedophiles can become "incited" by imagery, such as sex dolls, while others may be satiated or satisfied before committing actual crimes. Outcomes differ according to many factors including stress, Collins testified.

The trial is scheduled to continue through Thursday and resume in court for two days starting April 6.