From the sexually transmitted diseases mentioned below, identify the one which does not specifically affect the sex organs:

Syphilis can infect sex organs and sometimes lips and mouth as well. They can spread from one person to another. So option (a) is incorrect.

Gonorrhea most often affects the urethra, rectum or throat. In females, gonorrhea can also infect the cervix. So option (c) is incorrect.

Genital warts are contagious, fleshy growths in the genital or anal area. They are one of the most common types of STDs. So, option (d) is incorrect.

AIDS (Acquired Immuno Deficiency Syndrome) is a set of symptoms caused by HIV virus in humans. The HIV virus does not directly affect sex organs but produces other set of symptoms in the body of infected person.

So, correct answer is option (b).