A 'good and very responsible father' told a court his wife's lack of interest in sex drove him to molest their 13-year-old daughter. The 38-year-old technician was jailed for four years yesterday after pleading guilty to incest in the Court of First Instance. 'The defendant was a good father to the victim,' defence barrister Michael Ko Chun said in mitigation. 'Through a series of problems with the wife's health, the sexual relationship became the centre of the problem.' Mr Ko said the wife started suffering from heart palpitations brought on by anxiety in 1993. The condition affected the couple's sex life and reduced the frequency of intercourse to about twice a month. The technician allegedly became so frustrated that he turned his attentions to his daughter. He admitted committing incest with the girl twice - once in April last year and again in February. The man's confession came on the second day of his trial on a charge of rape, after the girl had told her story to the jury. He agreed to plead guilty to the lesser charge of incest. However, the victim's mother sent a letter to the court begging for leniency. She described her husband as 'a good man' and 'very responsible'. 'The girl felt she had done some wrong in disclosing the incident,' Mr Ko said. 'She felt little harm had been done to her.' A letter from the victim said she had forgiven her father. But Mr Justice Gerard Muttrie said the victim's defence of her father was a sign of the damage he had inflicted. 'That she looks back with such equanimity on having had sex with her own father suggested to me psychological damage just as much as if she had looked back on it with horror,' he said.