Mistie walked out of her son’s life shortly after he was born. More than 15 years later, she reconnected with the teen, and the two engaged in a sexual relationship. Mistie admits that what she did was completely wrong. She insists, however, that she is not a sexual offender and claims a condition known as Genetic Sexual Attraction, or GSA, could explain her behavior. 

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Dr. Justin Lehmiller, a Kinsey Institute Research Fellow and social and sexual psychology expert, explains GSA and where the concept originated. In the video above, he and Dr. Phil explain why they don’t believe this is what caused Mistie’s behavior, and they share what they believe may actually have influenced her to behave as she did.

WATCH: ‘I’m A Disgusting Person For This,’ Says Woman Who Had Sex With Teenage Son She Didn’t Raise

On Thursday’s episode, hear more of Mistie’s story. And, is Mistie ready to accept help? Check here to see where you can watch.