J. Scott Verinis, writing in "Medical Aspects of Human Sexuality," suggests that the size of a man's penis initially matters both to the male and the female. "However," he says, "as the relationship progresses, the size of the penis becomes less important to most women, and factors such as the quality of sexual performance and the nature of the interpersonal relationship receive higher priority." Men, however, continue to value the size of the penis at all stages of the relationship. Bottom line: Size matters to some of the people all of the time and to all of the people some of the time, but not to all of the people all of the time.