The incest question: What if you were conceived with donor sperm, grew up and then dated a sibling without knowing it? Do you just go for it and hope for the best? I see they scatter these samples all over the country. It seems like they're acting more on faith than anything else. Seriously, wouldn't you like to have some background knowledge? Isn't there a health issue to consider here? What if your secret donor father has a history of medical illness and you don't know about it?