The CDC states that 1 in 4 women between the ages of 15-24 will contract an STI this year and half of all new STI cases are acquired by young people between 15-24. (http://www.cdc.gov/std/stats14/adol.htm)
Abstinence is the choice to refrain from sexual activity until marriage. It is a positive lifestyle that emphasizes personal responsibility, healthy relationship skills, and so much more.
Abstinence is the only 100% effective means for preventing all sexually transmitted diseases, unwanted pregnancy, and the emotional consequences often associated with sex outside of marriage.
Yes, STIs can be prevented. Avoid all sexual activity if you are single or be faithful to one uninfected partner for life. This is the only way to avoid the risk of infections.