River of life..., Why is using your OWN blood taboo? Options

Lets face it, blood is one of the most metaphysically powerful substances a witch has access to. And it is HERS (or his). So what is the hysteria that is so prevailent these days about using your OWN blood in rituals to add power to it. i can see in the old days when witchcraft was first struggling to come back and gain acceptance and they wanted to seem as bunny fluff as possible so that there would be no violent reprecussions. But we are past that stage now. i understand that wiccans don't want anyone to think that their Godess demands blood, but i am talking about witches. Blood freely and joyfully given is a powerful tool and i think it is a shame that we are letting fear ruin it for us. Now i know that it is a touchy subject for alot of people so, please, lets keep this as a friendly discussion. Thanks all

i was wondering were to cut for blood, i want to bake cookies with my own blood to use during ritual workings. Something to put me in the right state of mind, with a good power boost.

But i must admit, it sounds a little eerie to cut into myself, and i want to be sure that i don't harm myself. What is the best place to cut yourself?