Amberly Rothfield is a professional phone sex operator.<br />She wrote the book "How I Made $10,000 a month as a Phone Sex Operator."<br />Rothfield started doing phone sex work at the age of 18, when she was broke, couch-surfing, and struggling to support herself.<br />Business Insider reports she is now, 15 years later, she lives on a seven-acre farm with her wife and kids.<br />She makes calls from her car just three nights a week.<br />She earns on average $300 to $400 a night for four hours of work.