I just saw something about sperm banks. They were talking about how it is going to become a disaster. Think about it, a man can father hundreds of children through just one or two donations. Some men donate multiple times. More then likely all of these children will grow up living in the general area of the sperm bank. Sperm bank donations are generally anonymous. Odds are much higher that brothers will unknowingly marry sisters and whatnot. I'd never thought of that until I saw that on TV, but it is so true!