That is somewhat misleading.
Just because there are more Asian tourists in Thailand, does not mean they are sex tourists. Western males still way outnumber any other group in Thailand in terms of sex tourists.
Sure - there are a ton of Chinese tourists here now but they are not sex tourists.
What about the Indians? the Koreans? The Japaneses?
Indians are all over Pattaya and Bangkok.
Japaneses used to be somewhat segregated in Soi Thaniya but it is not possible anymore largely because of their large number.
What about the Koreans then?
Maybe this article from this year
"Korean men are top sex tourists in Southeast Asia" will clue you a bit.
http://www.examiner.com/article/koreans-men-are-top-sex-tourists-southeast-asiaBut no no, of course, it is always the white manOh and :
The U.S. State Department's annual report on human trafficking also confirms that Korean men are the main client for child prostitutes in Southeast Asia and Pacific islands
.