A study recently published in the journal of the Royal College of Paediatricians of Thailand has found that the average age for Thai teens to start having sex was 16, compared with 17 for Californians. The study also found that the rate of condom use among Californian teens was 58 percent, while just 23 percent of Thai teens regularly use condoms. The release of the study corresponded with the Bangkok Metropolitan Police’s launch of its "Four Don'ts" campaign to prevent teen girls from having unsafe sex on Valentine's Day. The Four Don'ts included "Don't leave an opportunity, don't expose your goods, don't give a green light and don't disregard prevention."