Hormones are responsible for large labia, particularly estrogen at the time of puberty. Pregnancy and childbirth can also cause enlargement and elongation of the labia minora. For men, breast development (gynecomastia) can be a source of stress: breasts are feminine traits and can be quite distressing. Similarly, enlargement of the genitalia in women, specifically the labia minora, can be perceived as a masculine trait. As such, large inner labia can be distressing to young women and is homologous to breast development in men (gynecomastia).