Yesterday's case involving Chan Lai-ching was the third trial in Hong Kong to feature the unusual crime of passion since December last year.
On December 4 last year, Lam Yuk-kam, 42, who pleaded guilty to cutting off the penis of her two-timing husband, was released after spending nine months in prison when her spouse, Chu Chi-lik, 41, made a plea for leniency in the Court of First Instance.
Mr Chu had an operation to re-attach his penis.
In August this year, Poon Shuk-yee, 27, was jailed for 4.5 years after she severed her boyfriend's penis with a paper cutter when he tried to end their relationship.
A Court of First Instance jury found her guilty of one charge of wounding Chan Chi-keung, 35, with intent.
The emergence of such crimes in Hong Kong comes after the case widely believed to have started a worldwide trend - the lurid trial of Lorena Bobbitt in the United States.