A jobless man who made his lover's underage and retarded daughter pregnant was jailed for two years and eight months yesterday. Deputy District Court Judge Andrew Chan Hing-wai said he found the case detestable, noting that a Social Welfare Department report had found the victim's mother 'encouraged such kinds of activity'. The 45-year-old man was found guilty of seven counts of unlawful sexual intercourse with a girl under the age of 16 between February 2002 and January last year. The victim, who has an IQ of 83, first had sex with him when she was 13. She was then said to have had sexual intercourse with the man on a systematic and regular basis over a two-year period. The relationship came to light in May last year when social workers found out the girl was pregnant. Judge Chan noted that there were a number of aggravating factors behind the sentencing, including the 30-year age gap between the girl and the man, who he said 'was fully aware of her age and mental deficiency'. He remarked that the man had abused his position within the family. 'It seems clear to me that the defendant took advantage of the girl physically and emotionally,' Judge Chan said. He also said the girl had sent a letter to the court, in which she described the man as her boyfriend and husband and pleaded for a lenient sentence. The court was told the man and the victim's mother had been living with each other for almost five years. The girl and her two younger brothers had been in foster care since July 1999 because their mother had been unable to care for them. The girl first had sex with her mother's lover when she was on one of her regular periods of weekly home leave around Lunar New Year in 2002. After that, she had occasional sexual intercourse with him when she returned home on leave, the court was told. The man learned of the girl's pregnancy in December 2003 but ordered her to keep the matter quiet. In May last year a social worker suspected the girl was pregnant when she discovered that she had not bought sanitary napkins for more than six months. A subsequent test confirmed she was 23 weeks' pregnant. The man was arrested on May 11. It is understood that the victim's baby will be put up for adoption.