If you can't spell it, you can't be it.
Only men of a certain religion are polygamist. The wives in a polygamist marriage are all monogamist.
It appears that trichomoniasis is one of the few STDs that can be caught through other means as well. Although the protozoan dies rapidly in dry conditions, it appears that you can be infected by sharing a washcloth with an infected person, or possibly by having your genitals come into contact with someone else's infected genital discharge.