It is certainly not the most common sex crime, and it is one which most people simply cannot fathom. Now, an Oklahoma couple has been jailed after police found a video in which a woman engaged in a sex act with a dog.

Robert S. Mettler, 44, of Claremore, allegedly admitted to police that watching women and dogs engage in sexual activity was a "fantasy" of his. Police serving a search warrant at the home found multiple pornographic videos of women committing sex acts including intercourse with dogs.

One of those videos led to the arrest of Mettler's wife, Brenda Mettler, 42. Investigators say the video depicted a white Boxer performing oral sex on the woman. She allegedly told police that it was a "one-time deal" that happened several years ago, and that the dog in the video is no longer alive.

The video had been posted on the internet, and both Mettlers denied knowing it had been uploaded to a bestiality website, with Robert saying that his account must have been hacked. However, investigators say they found the same video featuring Brenda and posted on the website on Robert Mettler's cell phone.

Both Robert and Brenda Mettler were arrested on complaints of crimes against nature, animal cruelty, and distributing obscene material. Each was booked into the Rogers County Jail and released on $60,000 bond.

"Sodomy" is a vaguely defined term under Oklahoma law. In various circumstances, it can refer to anal sex, oral sex, or bestiality, although few people would put those acts on the same level as "detestable and abominable crime[s] against nature." Oklahoma's "crime against nature" law is found in 21 O.S. 886:

"Every person who is guilty of the detestable and abominable crime against nature, committed with mankind or with a beast, is punishable by imprisonment in the custody of the Department of Corrections not exceeding ten (10) years."

Additionally, anyone charged with crimes against nature involving bestiality will also be charged with animal cruelty. "Acts of Cruelty to Animals" is prohibited in 21 O.S. 1685:

"Any person who shall willfully or maliciously torture, destroy or kill, or cruelly beat or injure, maim or mutilate any animal in subjugation or captivity, whether wild or tame, and whether belonging to the person or to another, or deprive any such animal of necessary food, drink, shelter, or veterinary care to prevent suffering; or who shall cause, procure or permit any such animal to be so tortured, destroyed or killed, or cruelly beaten or injured, maimed or mutilated, or deprived of necessary food, drink, shelter, or veterinary care to prevent suffering; or who shall willfully set on foot, instigate, engage in, or in any way further any act of cruelty to any animal, or any act tending to produce such cruelty, shall be guilty of a felony and shall be punished by imprisonment in the State Penitentiary not exceeding five (5) years, or by imprisonment in the county jail not exceeding one (1) year, or by a fine not exceeding Five Thousand Dollars ($5,000.00). Any animal so maltreated or abused shall be considered an abused or neglected animal."

Finally, because the pair is accused of uploading the video to a bestiality website, they have been charged with distributing obscene material, which is a felony under 21 O.S. 1021, a part of the Oklahoma Law on Obscenity and Child Pornography. A portion of this statute reads as follows:

"Every person who willfully and knowingly . . . distributes . . . any obscene material . . . shall be guilty, upon conviction, of a felony and shall be punished by the imposition of a fine of not less than Five Hundred Dollars ($500.00) nor more than Twenty Thousand Dollars ($20,000.00) or by imprisonment for not less than thirty (30) days nor more than ten (10) years, or by both such fine and imprisonment."

If convicted of the crimes of which they are accused, the defendants face up to 25 years in prison.