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

Even in theology at St. Thomas Aquinas in Houston they taught us the jewish belief that the life of a thing is in its blood, hence the sacrificing of the lamb to god.
So while saliva may have your dna, by there belief it doesn't hold the same concentration of life, otherwise they would have been happy to shave the lambs and offer god lamb hair, but there is no such presedence that I know of in Jewish/Christian mythos, and as I'm a catholic, I tend to fallow presedence of tradition when possible, but one can't help but expiriement, it helps us single out specific effects...
†Christoher Raven† (IMG:style_emoticons/default/butcher.gif)