How deep is the vagina of a woman? How long is the penis when erect?

Patient's question:

I recently don't know what's wrong with me, my lower body is very uncomfortable, and I'm not getting morning erections anymore. Could you please tell me how deep a woman's vagina is and how long an erect penis is?

Doctor's answer:

The average vaginal length is 6 to 8 centimeters. When aroused, the extension of vaginal folds can generally accommodate a male penis, but it's not always necessary for the penis to be fully inserted during intercourse, so there's no need to worry about length affecting sexual quality.
Research shows: In China, the longest flaccid penis is 11 centimeters, the shortest is 3 centimeters, with an average of 6 centimeters; the widest diameter is 4.0 centimeters, the narrowest is 1.5 centimeters, with an average of 2.5 centimeters; when erect, the longest penis is 18 centimeters, the shortest is 8 centimeters, with an average of 12 centimeters.

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