Some nonbinary people who were assigned female at birth want to look and sound in such a way that most people will see them as men. Masculinizing hormone therapy such as Testosterone does this. It is a medicine that a person takes on a regular basis, which makes them go through many of the same changes that men went through at puberty. Some effects of it last only as long as the person takes that medicine, and will go away if they stop, such as looking like a man (due to skin texture, body odor, tending to have more muscle, and where the body stores fat) and having no period. Other effects of this medicine are permanent once they happen, such as growing more facial and body hair, and getting a lower voice. Masculinizing hormone therapy does not stop a person from being able to get pregnant.