Vice 'magnet' claims over 2014 Games

The stark warning was issued by the Scottish Trade Union Congress, which called for vigilance to prevent the sex trade flourishing during the event.

Other major fixtures, such as the World Cup and the Olympic Games had become centres of sexual exploitation in the past, STUC general secretary Grahame Smith said.

Large numbers of men descending on host cities meant they could be transformed into hotspots for traffickers, he added.

Glasgow beat competition from Abuja, in Nigeria, to host the games in 2014.

But Mr Smith today said: "There is evidence from organisations that have been involved in this issue that events like the World Cup, for example, or the Olympic Games, where you have large numbers of men attending, the availability of certain services and the demand for these increases."

He said there was a "need to ensure when the Commonwealth Games come to Glasgow that it doesn't become a magnet for traffickers".

The issues of exploitation and trafficking at the Games are included in a motion to be debated at the STUC's annual congress in Inverness next week. Also high on the agenda will be concerns over the economy in the wake of the credit crisis.

Other issues include a balanced energy strategy, worries over post office closures and fears that rapid advances in technology are leading to "cyberbullying" of some workers.

Keynote speakers will include First Minister Alex Salmond and Scottish Labour leader Wendy Alexander.

A senior minister from the UK Government will also speak, but it is yet to be confirmed who this will be.

The STUC represents around 630,000 trade unionists, who are members of 46 affiliated trade unions.

A Glasgow 2014 spokesperson said: "We support attention being drawn to the tragic issue of human trafficking. While the scale of the Games mean they are much less of a magnet for such issues, any exploitation is unacceptable and we will support relevant authorities working in this area."