John Mayer likes to say that your body is a wonderlandbut if you’re into selling bodily fluids, it’s more like a cash machine. If you haven’t done it, it might sound pretty extreme — and pretty gross — but there’s a booming business in bodily fluids. So what bodily fluids are worth money? And what’s the cost to donors in terms of their time, effort and, perhaps most importantly, their discomfort? Here are five bodily fluids you can sell. Plasma is probably the simplest, least questionable bodily fluid you can sell. This clear fluid contains enzymes and antibodies and is the largest component of human blood. Even though a lot of plasma goes to pharmaceutical companies, it is used to create treatments for people with blood clotting disorders, autoimmune diseases, or even serious burns, so it’s a move you can feel pretty good. As long as you aren’t too needle-shy, donation is relatively painless; blood is drawn from your arm and pulled through a ma...