My organs are for those who want them, after I die. I made an exception though. They're not getting my bloodvessels and arteries. The thought of people handling my bloodchannels freaks me out. So, when I got a letter asking to tick what I was willing to donate, I ticked all but that one. Silly, I know. The codicil I had before that, I was offering all they could use.
Sometimes I think of changing the donation offer though. And tell them to make sure with my kids that it is OK. As soon as they are adults, they should be able to deal with a dead body still seeming alive, because of the machines keeping it functioning till the organs are harvested.
The discussion about making donation default or not is a discussion that comes up in my country now and then too.