A US woman who made a sex tape with her teenage son has denied she was being incestuous, instead saying it was a case of "genetic attraction".
Californian mum Mistie Rebecca Atkinson allegedly reunited with her 16-year-old son in October after not seeing him for 15 years.
She had tracked him down through Facebook and sent him nude photos of herself.
The boy's grandmother and relatives told police in October that Atkinson was sending inappropriate messages to him over Facebook.
The boy, who police described as "out of control", was allegedly sneaking out of home to meet with his mother despite there being a restraining order against her.
Police busted the pair together at a hotel room on March 2.
They found videos on the boy's phone showing Atkinson performing oral sex on her son a month earlier.
She was charged with incest, oral copulation, lewd contact with a minor and distribution of lewd material to a minor but Atkinson believes she should not be charged with incest.
"I don’t feel like I should have the charge of incest because there is something called genetic attraction that is a very powerful [phenomenon] that happens to 50 [per cent] or people becoming reunited with a long lost relative," she wrote in a letter to the Napa County Superior Court.
On Wednesday, she was sentenced to four years and eight months in jail.
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