What's the size of the average erect penis?

• 5.5 to 6.2 inches long and 4.7 to 5.1 inches in circumference
• 6.9 to 8.4 inches long and 4.7 to 5.1 inches in circumference
• 9.2 to 11.4 inches long and 4.7 to 5.1 inches in circumference.