You get trichomoniasis from having sex with someone who has it. Typically, the disease is passed between the penis and vagina, and it doesn’t matter if a man ejaculates or not -- it can be spread just through contact. Women who have sex with women can also get it because it can spread through vaginal contact, as well.
Women typically get the infection in their vulva, vagina, cervix, or urethra. Men usually get it just inside their penis in the urethra, but they may also get it in their prostate. You don’t typically get it in other parts of your body, such as your hands, mouth, or anus.
The thing to keep in mind with this condition is that you can spread it even if you don’t have any symptoms. That also means you can get it from someone who doesn’t have any symptoms