Scientific study of variations in female genital dimensions

With so much misinformation out there about what is “normal” when it comes to womens’ vulvas, I decided to do some research to get to the hard facts around this issue. This included a poll that I ran on the Labia Project to establish what proportion of visitors have “innie vaginas” and “outie vaginas”. I also located an academic article about a scientific study of variations in female genital dimensions.

The results of the Innie vs Outie Vagina Poll (which had over 500 participants) showed that around 80% of women have outie vaginas (inner labia that protrude through the outer labia), compared to around 20% who have innie vaginas (inner labia that are not visible through the outer labia).

With regard to the academic article, it is entitled “Female genital appearance: ‘normality’ unfolds”. It was authored by Ms S. M. Creighton of the Department of Gynaecology at Elizabeth Garrett Anderson Hospital in London, and it was published in 2004 in the International Journal of Obstetrics and Gynecology.

The objective of the study was to describe variations in genital dimensions of normal women, and it involved a physical observational study of 50 pre-menopausal women, to establish variations in various parts of their vulvas including clitoral size, labia length, width and color and vaginal length.

The study found that there was no statistically significant association between different labia sizes and colors, and womens’ age, ethnicity, or history of sexual activity. It found that women vary widely in genital dimensions.

The study found the following range of dimensions among the participants:

Range Mean (Average)
Clitoral length (mm) 5–35 19.1 [8.7]
Clitoral glans width (mm) 3–10 5.5 [1.7]
Clitoris to urethra (mm) 16–45 28.5 [7.1]
Labia majora length (cm) 7.0–12.0 9.3 [1.3]
Labia minora length (mm) 20–100 60.6 [17.2]
Labia minora width (mm) 7–50 21.8 [9.4]
Perineum length (mm) 15–55 31.3 [8.5]
Vaginal length (cm) 6.5–12.5 9.6 [1.5]

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