A MARRIED mother-of-two who started a secret sexual relationship with a 13-year-old boy has been jailed for five years.

Deborah Goulopoulos was 42 the first time she had sex with her teenage victim in her home in 2002.

He was a student at a Melbourne private school.

County Court judge Carolyn Douglas said this morning Goulopoulos had deliberately groomed the boy with pornography, drugs and alcohol before the first sexual encounter.

She said after her marriage broke down Goulopoulos had turned to her children and their friends for emotional attachment.

"You were acting as if you were the same age as the complainant and his friends," she said.

Judge Douglas said the woman would party with the young victim, who cannot be named, and ply him and his friends with alcohol and drugs.

She said Goulopolous funded the expensive drug habit and showered more than $39,000 worth of gifts on her victim.

Judge Douglas said while the relationship was generally kept secret, among the victim’s friends it was widely known.

She said the couple had had sex in the back seat of a car in close proximity to the victim’s friends.

The sexual relationship between the pair lasted more than two years and ended when the victim was 16.

After it stopped Goulopolous attempted to take her own life, the court heard.

The victim, who cannot be named, earlier told the court the sexual relationship had made him feel sick.

He described Goulopoulos as a predator who preyed on helpless children and said on some occasions she had slept with him while her children were asleep in the same room.

"I can't say how many times it happened, but it was continuous," he said in documents tendered to the court.

"Every time I stayed at the house... Deborah would put it on me... we had sex many times when (her kids) were in the room."

The court heard at other times Goulopoulos would phone the victim's school, pretending to be his mother, to get him out of class.

The pair would then have sex during the day.

The victim said his life had spiralled downhill after Goulopoulos got him addicted to speed.

Goulopoulos pleaded guilty to one charge of persistent sexual abuse of a child under 16.

Judge Douglas said she had to send a strong message to community about the "morally reprehensible and inappropriate crime".

"In a civilised society adults are responsible for the sexual integrity of young people," she said.

She said as the mother of one of the victim’s friends, Goulopoulos had a particular duty of care to him.

She said Goulopoulos had shown “little insight” to her offending and had acted like a "self indulgent teenager".

Goulopoulos was sentenced to a maximum of seven years imprisonment.

She must serve five years in custody before being released.

She will also be placed on the sexual offenders register.

Shannon.deery@news.com.au

Originally published as Mum jailed for sex with teen boy