Trichomoniasis is not spread by toilet seats, according to the Center for Young Women's Health. It is a common form of vaginitis occurring in teens and adults. The disease only spreads through sexual intercourse.
The single-celled parasite responsible for trichomoniasis lives and multiplies in men but rarely causes any symptoms, warns the Center for Young Women's Health. Once it transfers to a female, it can take several weeks to cause symptoms, but she may pass the organism to other sexual partners. With a diagnosis of trichomoniasis, both sexual partners need treatment. Treatment requires a prescription antibiotic, which is available in a single dose. Sexual abstinence is the only way to prevent the spread of the disease, although condoms provide some degree of protection.