Influence of media on teenagers’ behaviors, especially sexual behaviors, is very important. Thai youths nowadays spend most of their time with different types of media for not less than 8 hours a day. This is divided into 3.1 hours per day for internet, 5.7 hours per day for television, whereas only 39 minutes per day for reading. Comparing to internet, Thai youths spend their time 6 times less on reading. From a study, there are very few websites for education. Moreover, smong 40 most popular websites in Thailand, 52.5 % has inappropriate information about issues related to sex, and 17.5 % is obscene, adulterated and violent. For television, only 5% is education program. In addition, only 1% of total radio programs in Thailand are safe media specifically provided for youths.