https://www.nichd.nih.gov/health/topics/stds/conditioninfo/Pages/types.aspx
http://www.cdc.gov/std/life-stages-populations/adolescents-
youngadults.htmhttp://www.cdc.gov/std/pregnancy/default.htmhttp://www.cd
c.gov/std/prevention/default.htm
https://www.nichd.nih.gov/health/topics/stds