{{cquote|Gay, bisexual, and other men who have sex with men (MSM) represent approximately 2% of the United States population, yet are the population most severely affected by HIV. In 2010, young MSM (aged 13-24 years) accounted for 72% of new HIV infections among all persons aged 13 to 24, and 30% of new infections among all MSM. At the end of 2010, an estimated 489,121 (56%) persons living with an HIV diagnosis in the United States were MSM or MSM-IDU.<ref>[http://www.lifesitenews.com/blog/why-hiv-syphilis-and-gonorrhea-are-rising-among-homosexuals Why HIV, syphilis, and gonorrhea are rising among homosexuals]</ref>}}
In 2012, an abstract for a ''The Brazilian Journal of Infectious Diseases'' articled entitled ''Clinical manifestations of primary syphilis in homosexual men'' indicated, "At the beginning of a new millennium, syphilis incidence has been increasing worldwide, occurring primarily among men who have sex with men (MSM)."<ref>[http://www.sciencedirect.com/science/article/pii/S1413867012000621 ''The Brazilian Journal of Infectious Diseases''.''Clinical manifestations of primary syphilis in homosexual men'', Milan Bjekića, Milica Markovića, Sandra Šipetićb]</ref> In the United States, 75 percent of the syphilis cases between 2011 and 2012 were among men who had sex with men (MSM).<ref>[http://www.aidsmeds.com/articles/STD_rates_1667_25048.shtml CDC Reports 'Troubling Rise' in Syphilis in Gay and Bi Men]</ref> In 2012, gonorrhea and syphilis spreading among homosexual men engaging in sexual activity with one another increased in prevalence.<ref>[https://www.catholic.org/news/health/story.php?id=53827 Gonorrhea, syphilis spreading among homosexual men engaging in sexual activity with one another]</ref>
== Gay bowel syndrome - terminology usage ==