A BRAZILIAN woman has confessed to trying to kill her husband by putting poison in her vagina and urging him to have oral sex with her, a news agency claims.

The bizarre murder plot, dubbed "cunning cunnilingus" by one commentator, took place in the city of Sao de Jose Rio Preto.

The intended victim, a 43-year-old man who has not been named, says his wife tried to lure him into bed and encouraged him to perform oral sex on her. His suspicions were aroused when he noticed an unusual odour emanating from her private parts and, fearing she was unwell, took her to hospital, Brazil's Tvi24 reports. Medical tests revealed she had doused her vagina with enough of the unspecified toxin to kill both her husband and herself.

Confronted with the test results the woman reportedly confessed to her crime. It is believed she hatched the bizarre plot after asking her husband for a divorce, a request he now seems rather more likely to acquiesce to. Tvi24 says the woman has received medical treatment and sources claim her husband plans to sue her for attempted murder.

Vagina homicide is, needless to say, a highly unusual crime and a local police officer called Walter Coacino Junior has reportedly ordered "further investigation" due to the "nature" of the case. The woman may still face murder charges, he said.

The Jezebel website points out that "poisoning someone through your vagina is not that good of an idea" because "your vagina is fairly absorbent and shoving a bunch of poison in it will probably hurt you as much as it hurts the person you're trying to kill."

But Salon's Katie McDonough says the fact the man rushed his wife to hospital despite her death-by-vagina plotting suggests "chivalry is not dead".