JUST SAY NO!
This is the chorus of Thai politicians offering a solution for political, financial and social problems. What is disappointing about this line of thinking is the lack of thinking. As many here have stated, how can you enforce such a notion? The best you can do is discourage sexual activity among youth. Religion and education are two influential agents. Teach the younsters to make good decisions.
Any kind of political iniative has to be planned with all viewpoints actiive in the planning process. First you need consensus and then it needs funding, and now I will say that big swear word - enforcement. Any efforts at enforcement must be consistent, concerted and considered outside of the punishment box. You cannot carry the mentality 'lock 'em up first time, lock em longer the second time" and so on. We are talking about our young people, a product of us. We need to correct this AIDS onset with the philosophy of doing it for the public good.
Attaching any kind of criminal element to this problem, even peripherally would be nothing more than an act of desperation. Think of the US War on Drugs. And of course as is usual with many Thai politicians, use foreigners as a scape goat.
Trying to arrest your way out of this public concern would create the Sex Police in some form or other and then we would have to solve the voyeur problem. Perhaps the only use for Sex Police would be the name of a band.