[Solved] The lipids that form the largest part of cell membranes are the ____________________. Cost-Benefit Analysis: The process of comparing the costs and benefits associated with a decision or project to determine its feasibility or worth. Erogenous Zone: Areas of the human body that are particularly sensitive to sexual stimulation. Sensate Focus: A sex-therapy exercise in which partners take turns pleasuring each other with guided verbal feedback and in which certain kinds of stimulation are temporarily forbidden. Autoerotic Zone: Areas of the body that provide sexual pleasure when stimulated, a concept often discussed in psychoanalytic theories of sexual development.