Undercover detectives arrested two teens on charges of prostitution on the city's Northwest side.
Marisol De La Rosa, 18, is charged with compelling prostitution, causing a child to commit prostitution, and failure to identify herself to a police officer.
A 16-year-old is facing a charge of prostitution.
San Antonio police say undercover detectives were driving when De La Rosa (pictured) flagged them down.
They said she told one officer that he "could have the teen for $50."
The 16-year-old was taken to juvenile detention while De La Rosa was booked into jail.