Final answer:
Dopamine is the neurochemical that Helen Fisher sees as important in human sexuality. It plays a key role in neural development and binds to receptors to increase the concentration of cAMP in the brain.
Step-by-step explanation:
Helen Fisher suggests that dopamine is a neurochemical that she sees as important in human sexuality. Dopamine is a neurotransmitter in the brain that causes long-term responses in neurons and plays a key role in neural development. When dopamine binds to its receptor, it increases the concentration of cAMP in the brain.