Aon, who lives in Phetchabun province north of Bangkok, said she agreed to use her own eggs, was paid about Aus$5,500 (US$5,122) and gave birth to twins some years ago. The report did not specify the age of the children.
The Australian couple took the children home, but court documents reveal that the father, who cannot be named, was last year charged with indecently dealing with them, the ABC said.
The man, who reportedly denies the allegations which also include the alleged possession of child abuse material, is expected to fight the charges when they come before court later this year.
Commercial surrogacy is illegal in Australia, but growing numbers of people are travelling to countries such as India and Thailand to engage women to carry their babies.
Gay men often use surrogates too. I feel sorry for these very" poor:" mothers who see this as a way to help their own children.