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26 May 2015, 05:17 | Updated: 26 May 2015, 06:37
A Heart investigation's found 240 women under 25s told sexual health nurses they had been paid for sex in the past.
In total 676 women off all ages admitted working in the sex trade over the last three years.
Charities have told Heart they believe the real figure is likely to be much higher than that.
The Freedom of Information request to sexual health clinics revealed the youngest person to tell nurses they had been paid for sex was 15.
Tracy Gibbs is project manager for Hi's N Lows which helps women in Walsall and told Heart she's not surprised some are so young:
She thinks many children are forced to grow up to fast: