The two were driving through the red-light district in Nottingham, England, last summer when the father decided it was time for his boy to become a man.
"The boy said that they had driven past the girl and his dad pointed to her and said, 'Will she do?'" city prosecutor Adrian Harris said.
Evidently she did because within minutes they pulled up to "Sarah" and startled haggling.
"Come on, baby," the 42-year-old Polish immigrant said, according to Harris. "How much for a proper shagging for him?"
After they settled on a $30 fee, the hooker revealed she was an undercover cop and arrested them both.
Judge Jonathan Teare told the man his job was to look after the "moral welfare" of his son and not "break him in to the ways of sex through a prostitute."
Teare, however, said she didn't believe the father meant to harm his son. He put the man - whose name was not divulged - on a sex offender registry for five years but suspended his 10-month prison sentence. He also allowed the boy to continue living with his father.
Teare appeared to be moved by the man's tragic story of how he and his son moved to England eight years earlier after the boy's mother died - and how his new wife suffers from schizophrenia.