Tokyo - A former boxer who chopped off the penis of his wife's lover with a pair of garden shears before flushing it down the toilet was jailed in Japan on Tuesday. Ikki Kotsugai, 25, carried out the "vicious" attack in August 2015 when he burst into the office of a lawyer who had an affair with his wife. Kotsugai, an ex-boxer and law student, became enraged after mistakenly believing his wife had been forced to sleep with her boss at a legal firm, when in reality the affair was consensual, the judge said at Tokyo District Court, according to Jiji Press.The Sankei Shimbun daily newspaper reported that Kotsugai's wife had falsely told him that she was forced to have sex with the lawyer.He was sentenced to four years and six months on Tuesday by presiding judge Kazunori Karei."An irreparable injury has been sustained," Karei told the court, according to Jiji, calling the crime "extremely dangerous and vicious". Kotsugai has since apologised to the victim, who also apologised for having the affair with his wife, the Sankei reported.