Looking at the U.S., there are 12 million of new STD cases a year, and actually teenagers are the highest risk group. So if you take a group of sexually active individuals, you will find that the absolute youngest are at the highest risk for developing STDs. I remember when I saw for the first time that it was 14-19 year old girls that had sky-high rates of STDs - Gonorrhea and Chlamydia - if they’re sexually active, as compared with any other group, it was pretty distressing.