Can I bother you for a kidney?

On the radio this afternoon they were talking about donating kidneys. It got me thinking about whether or not I would ever give my kidney to anyone and I was surprised to find myself saying no, I wouldn't give my kidney to anyone except maybe my child that I will probably never have. It was a scary thought. I always thought I would give it if anyone ever needed it but how many people can I count to be around for the rest of my life. That may sound selfish but let's be realistic here. It is extremely invasive to the donor, I think more so then to the receipient. I think it takes years off the donor's life. Then let's say you stop talking, years go by and now some schmuck that can't be bothered to call you is walking around with one of your major organs. I know that is selfish but I am just being honest. It's not like a monetary loan that you may not get back or a letter of recommendation, it's an organ people! I don't know if any body I know would even ask but if they did, they should be prepared for me to scrutinize every moment of our relationship. Kristian said I am on his very short list of people he would give his kidney to. I feel bad but I'd still have to say that I'd have to seriously think about it before I could return the favor. I guess it's cause I'm an only child. Am I wrong here?