For one, as far as your girlfriend's health and well-being are affected, a yeast infection
a relatively benign problem, can be uncomfortable. Yeast, most commonly of the candida albicans species, reside naturally in warm, moist areas, like the vagina. When conditions allow, for example, when the body's natural pH balance is upset, yeast can begin to grow profusely, thus causing a yeast infection.
It is possible to transfer yeast to a sexual partner.