The reason behind the donation is to keep life going or to give the individuals receiving the blood more time to live (Copeman 130).
Absolutely no love spell a woman can use on a man will top using blood, in my experience.

If blood was not sacrificed to the gods, the humans believed they would be punished and endure excessive pain “more violent than any man could ever do” (Pendragon 3). Any ritual that involves the intentional release of blood Blood Magic (also sometimes called "Blood Magick"), also known as "Blood Sorcery", is an ancient and dangerous form of magic.This mystical but forbidden theurgy is used to cast spells, enchantments and even curses through blood, the very bodily fluid which is the potent force as well as the essence of life itself in the working of magic. Menstrual blood, vaginal fluid, semen, urine (that is, something from your genital region) into the loved one’s food or drink, and those in which you add such fluids to a personal scent or dressing oil and wear it on your body to captivate those whose attentions you desire. If blood was not sacrificed to the gods, the humans believed they would be punished and endure excessive pain “more violent than any man could ever do” (Pendragon 3).

Her blood would continue to nurture the nation even after her death…” (132).

Furthermore, the supply of ritual blood was believed to maintain plentiful fertile crops and aid in the continuation of the Aztec world. The Shi’ite Muslims practiced a ritual called Matam in 2002 in Britain (Malik 2). 2 or more individuals, typically male, intermingle their blood in some way. Some of the rituals involving blood have been practiced for many centuries, and are still being practiced in the 21st century (Baker 1, Copeman 2, Malik 2). The blood in the rituals has a symbolic meaning, depending on the group and ritual being performed. Blood rituals often involve a symbolic death and rebirth, as literal bodily birth involves bleeding. Blood Magic, or Blood Sorcery, refers to the magic performed by vampires, fueled by religious or occult practices and the power of Cainite vitae.

In other cases, blood is a primary component as the sacrifice, or material component for a spell. Blood sacrifice is sometimes considered by the practitioners of Some blood rituals involve two or more parties cutting themselves or each other followed by consumption of blood. This Ritual applies Regeneration with a duration of 2 seconds to any entity within 10 blocks of the Master Ritual Stone. The Aztecs believed the gods would provide plentiful crops and healthy long lives as long as blood was ritually given (Pendragon 2). In a sense, the donors are relating to the politicians, continuing good for the nation and continuing life through death (Copeman 136). Cost per damage tick and mob: 2LP .

Her blood would continue to nurture the nation even after her death…” (132). This can be an unsafe practice where blood-borne pathogens are concerned; the use of safe, sterilized equipment such as a lancet can mitigate this problem. A common blood ritual is the blood brother ritual, which started in ancient Europe and Asia. Those who are able to mentally handle using their blood can greatly increase the power of their spells, even as beginners. How to use blood in your witchcraft spells and magickal rituals Creating magick with blood spells is a very old witchcraft, and though it is often associated with black magic, it's not really good or bad. To practice Blood Sorcery is to twist one’s own Blood into submission. The blood donation is literally a donation to people who need transfusions (Copeman 132).
Form of Magic. Blood is typically seen as very powerful, and sometimes as unclean.

The Aztecs saw death as part of life, just like birth (Pendragron 2). There are two types of rituals: weak and standard. Prerequisites; 3. This is an ancient version that predates word-based magic and was considered by some to be more powerful. Regeneration is only applied if the entity is not already at maximum health.This Ritual can also have a “Healing” range set that allows entities within its range to gain regeneration, this needs to be within a vertical range of 19 blocks and a horizontal range of 19 blocks of the Master Ritual Stone.A second area can also be configured, Vampirism will syphon health of mobs which will be used to heal players within “Healing” range. 2 or more individuals, typically male, intermingle their blood in some way. The power to perform magical feats by using blood.

Blood Magic - A Comprehensive Guide . Though piercing does not always cause bleeding, it certainly can. Variation of Body Magic and Blood Manipulation. In a sense, the donors are relating to the politicians, continuing good for the nation and continuing life through death (Copeman 136). The participants donate at donation camps during the birthday or the anniversary of the politician’s death (129). This is important because even though these people died, they are still helping preserve life, by the people of India donating blood in their honor (Copeman 135). …

Some blood rituals involve two or more parties cutting themselves or each other followed by consumption of blood. According to Copeman, in a speech Indira Gandhi made in 1984, she “…strikingly associated her blood with the health of the nation. Take your favorite fandoms with you and never miss a beat. They believed the gods sacrificed their own blood to create the universe, so in turn, the Aztecs offered blood to the Gods as a sort of exchange and gift for their creations (Pendragon 2). The blood in the rituals has a symbolic meaning, depending on the group and ritual being performed. The reason why the politicians are involved with this is because the donors are making a connection with the dead, symbolizing the blood being donated to the blood of the politician being honored (Copeman 131).