It’s true–a healthy, natural breast has the same consistency as a sidewalk. If your breasts are soft, bouncy, and/or luscious, that is unnatural. Go see a breast-hardening doctor or a bricklayer to harden those things up now, Slappy.
Silicon is also used to make computer chips, because computer chips are designed to work like breasts. When you want to input information in your computer, you need to stimulate the breasts/computer chips first. Or at least use some lube.