And if you're worrying about your size pleasing your partner, remember that penetration is just one part of sex, and everyone's preferences are different. Many women don't even orgasm from penile-vaginal sex, for instance, and other people don't care very much about size or length. The size of your penis could possibly be unrelated entirely to your partner's ability to experience pleasure.
• This can be done by using a measurement tape to measure the penis circumference during an erection in the area that represents the midpoint of the penis length. If a measuirng tape is not available, use a piece of string. Place a knot near the end of the string. Wrap the string around the erect penis and hold the string adjacent to the knot. Place the string on a ruler by continuing to hold the string where first grasped and determine the length of the string from that grasping point to the knot. This will give you the circumference.