Biological motives include the most basic human motivations such as hunger,thirst,sex and sensory stimulation. Biological motives are wired into the body's nervous system and are necessary for human survival states Dr. Russ Dewey of Psych Web. Biological motivations are closely linked to homeostasis, the physical ability of a living creature to create balance in the body. Encyclopedia Britannica explains that if homeostasis is successful, life continues; if unsuccessful, disaster or death ensues.