Trichamoniasis, also known as “Trich” is a common sexually transmitted disease (STD) that affects about 7.4 million men and women in America each year. This STD is caused by a parasite called Trichamonas vaginalis.   Trich is most commonly found in women and uncircumcised men. Trich is the most common curable STD in sexually active men and women to this date. Trichamoniasis is primarily an infection of the reproductive organs and the urinary system (a.k.a. genitourinary system.) In men, the most common site of infection would be the urethra; the urinary tract. In women, the most common site of infection would be the vagina. In uncircumcised men, the most common site would be the tip of the penis.