Saying that blood fascination is a cry for attention is an extremely shallow statement.
Blood is our life water, gallons of it flow in our veins giving us oxygen and nutrients (and drugs

) and sustaining life. It is also a spiritual correlation between the beginning of life via menstrual cycle and the ending of it (usually involving blood) death.
As in the case of romantic blood letting/consuming, if done in a safe fashion, it can be a testament to the depth of love one has for another. Consuming the blood of another can resemble the bonding of souls forever. The resulting scarification can also carry the meaning of a visible vow and showmanship of their love.
It truly is a natural high to those who do cut themselves, others, or even have a preoccupation with knives, razors and sharp objects.
"In order to obtain the blood there must be some sort of physical damage done to the body. The anticipation of such damage is sufficient, even in the experienced practitioner, to excite the adrenal glands thus intensifying sensation with the increased presence of adrenaline. The pain incurred during the actual extraction of the blood then causes the body to release endorphins – pain-thwarting hormones akin to morphine. Katherine Ramsland, Ph.D, author of The Science of Vampires, even goes so far as to speculate that the vampire’s bite (and she bases this almost entirely on the details of fictional accounts) might increase the body’s production of DMT, a chemical that, when increased in the brain, can cause floating sensations, spiritual experiences, and sensory hallucinations."
- The Aesthetics of Blood by Alexzandria Baker
I personally find blood to be a beautiful thing and me and my lover do enjoy a few kinky things such as biting lips until they bleed. But dont bash people. to each their own.