" STDs affect millions of adults every year as cases of chlamydia, gonorrhea, and syphilis eclipse 2.6 million cases annually, based on updated CDC statistics. However, STDs disproportionately affect certain adult populations. Characteristics including age, sexual orientation, and drug use may increase or lower your STD risks; for example, LGBT individuals under the age of 25 are more likely to get an STD than older adults. Even though some groups of people have higher risks ...