It is estimated that about 1% of Thailand's GDP is earned through sexual exploitation tourism.
In 2003 (the last year for which full figures are available) some 545,000 British residents arrived on visits. If you remove the children, and the British citizens visiting for business or reasons other than a holiday, you arrive at about 489,000—314,000 men and 175,000 women. That is 139,000 more British men than women coming to Thailand for a holiday—a gap of 28 per cent.
In no other international holiday destination, is there such a big difference in the number of women and men travelling there. There is no obvious reason for this apart from prostitution.