'''Chlamydia trachomatis (chlamydia)'''
This presents similarly to gonorrhea, but is often asymptomatic, and is commonly carried without the patient knowing they are ill. This makes it especially dangerous as these carriers tend to continue the behaviour that got them infected in the first place, spreading the disease to their other sexual partners. Chlamydia is the most common STD in the developed world and can cause a number of severe complications, including infertility in both sexes. There are three different sub-types of the [[bacteria]] [[Chlamydia Trachomatis|Chlamydia trachomatis]] that cause [[Lymphogranuloma Venereum|lymphogranuloma venereum]].<ref>http://www.nlm.nih.gov/medlineplus/ency/article/000634.htm</ref> Lymphogranuloma venereum is one of the maladies associated with [[Gay
Bowel Syndrome|gay bowel syndrome]].<ref>http://www.nlm.nih.gov/medlineplus/ency/article/000634.htm</ref>
'''Treponema pallidum (syphillis)'''