Some girls never get them, other girls get them from the littlest hormone change, including scented soaps. If you fuck a girl everyday for five years and then stop, she might get a yeast infection, or at least feel one coming on and then you have to fuck her again.

Yeast organisms are always present in all people, but are usually prevented from "overgrowth" (uncontrolled multiplication resulting in symptoms) by naturally occurring microorganisms. -wikipedia

http://encyclopedia.thefreedictionar...east+infection