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Where there's demand, there's usually supply, and if the internet is anything to go by, there's a considerable supply in Wales.

Pete Clark of the Terrence Higgins Trust Cymru has been monitoring that activity over the past few months as part of a new research project in to the scale of the business.

He showed Eye On Wales that on one website alone 450 women in Wales had logged on to sell sex. At the same time 199 men were selling sex (in many cases to women), and 10 in the category of transgender were all available for sex in Wales.

That's just one website. Potentially the industry is massive. But it's also dangerous.

This week's Eye On Wales talks to three people in the business - a street sex worker in Cardiff, a brothel owner in Newport, and a male escort in Newport.

We ask these workers why they entered the business, what risks they face, and why, despite the hazards, they stay in the industry.

We also go out with the Safer Wales Streetlife project to find out what they're doing to get street sex workers to report instances of attack and rape.

And we talk to the Superintendent of the Newport local policing unit to find out how they go about policing their off street sex industry.