According to numbers released by the CDC, you are probably going to be with someone who has an STD at some point. The odds are just really stacked against you. Based on reporting from medical centers, and estimates made based on these numbers there are a staggering amount of cases of 3 major STDs in the US. When the 8 most common STDs are taken into consideration, it is estimated that around 110 million people, in the US alone, are infected with an STD. The chart below, courtesy of Satterwhite CL, et al. Sexually transmitted infections among U.S. women and men: Prevalence and incidence estimates, 2008. Sex Transm Dis 2013, will help you put this into perspective.
While HPV is really no surprise here, the number which is truly shocking to me is the number of syphilis cases in the US. At 117,000 estimated infections, roughly 1 person out of 2500 is infected with syphilis. Given that syphilis was thought to be well under control just 9 years ago (2.9 cases per 100,000), this is amazing to me. But, of course, you can blame us men for this; 91% of new syphilis cases in 2013 were a result of men contracting the disease.
Found below are maps released by the CDC illustrating the rates of infection per 100,000 people across all 50 states. You may notice that there is a concentration of infection in the Deep South for chlamydia and gonorrhea, while syphilis appears to be more an urban problem. I'm not sure how much can be read into this, but if anyone has something to offer to that area of conversation, I'd love to hear it in the comments. And now, for your viewing displeasure: