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The size of the penis has no relation to sexual pleasure or performance. Performance is about the ability to get and maintain an erection or to provide sexual pleasure to the partner and to oneself with or without an erection. Performance, then, is not really related to size -- but dependent on muscles, blood and nerve supply to the reproductive organs.
The average sexual length of the vagina is about 15 cm and only the outer third (5 cm) has the maximum nerve endings. The inner two-thirds (10 cm) is virtually insensitive. This leads to the conclusion that if a man wants to arouse his female partner, he should concentrate on the area of maximum nerve endings, i.e. the outer lips (labia major) and the outer third i.e. the outer 5 cm of the vagina. Therefore, for female sexual gratification, the size of the erect penis could be anything from 5 cm plus. Penile size is unimportant for female satisfaction and the size of the penis seems important only to those women who harbor the myth that “only a man with a big sized penis can satisfy his woman better.”
In reality sexual pleasure is related to: a person's state of mind; to respecting their partner's needs; and their own needs.