A policeman, who had sex with a 13-year-old friend of his son’s while his wife was pregnant with their third child, was given a jail term of three years and eight

months on Monday.

Constable Wong Wai-hung, 39, drove the girl – whom his son did school projects and played badminton with – to a flat on March 17, the officer’s birthday, last year for sex, the High Court heard.

He also molested the girl on two other occasions.

High Court judge Madam Justice Maggie Poon Man-kay said the girl had trusted Wong but he had “exploited her naivety”.

She said there was a “breach of trust”, adding that Wong had shown no regard for his moral and legal duties although he was clearly aware of them.

“Do as you would be done by,” the judge remarked, questioning what Wong would do if the same happened to his daughter.

Wong pleaded guilty to one count of indecent assault, one of attempted intercourse with a girl under 16, and one of intercourse with a girl under 16.

The girl’s identity was not revealed in court for legal reasons.

Wong’s legal representative, in making a plea for leniency, said his client was a caring father.

But Poon said there were a number of aggravating factors, including the fact that Wong practised unprotected sex.

The court had heard that on the day, Wong had sex with the girl without a condom.

A piece of tissue bearing a blood stain from the girl was later retrieved from the officer’s locker at Tin Shui Wai Police Station.

Wong first molested the girl on January 17 last year, when he kissed her and touched her breasts after driving her to a remote place after school. He was supposed to be giving her a lift home.

A month later, on February 25, he molested her again inside a Tin Shui Wai flat and attempted sexual intercourse.

Wong was said to have texted the 13-year-old, while his wife was about to give birth. The affair with the young girl lasted nearly a year, before her mother found out and reported the incident to police.

It was revealed in court that Wong’s wife was receiving psychiatric treatment.

Poon said Wong, a law enforcer, had brought shame on his family and the police force.

Reports indicated that the young girl had blamed herself for what was done to her, and that her interpersonal relationships had been affected, the judge noted.

Poon gave Wong a jail term of three years and eight months after taking into consideration various factors.