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^ Ding, Jing Song, Xiao-Chen Deng, Mou Zhu, Lan (3 June 2016)."Baseline dimensions of the human vagina". "Surface area of the human vagina as measured from vinyl polysiloxane casts". ^ "The Social - How much do you know about vaginas?"."Comparison of vaginal shapes in Afro-American, Caucasian and Hispanic women as seen with vinyl polysiloxane casting".

"The shape and dimensions of the human vagina as seen in three-dimensional vinyl polysiloxane casts".

Lawrence, citing Masters and Johnson's Human Sexual Response (1966), states that pages 73 and 74 of that book show that typical vaginal depth in Masters and Johnson's participants ranged from 7–8 cm (2.8–3.1 in) in an unstimulated state, to 11–12 cm (4.3–4.7 in) during sexual arousal with a speculum in place. Given the large range in vaginal dimensions noted in studies such as the above, many fitted vaginal devices, for example pessaries, do not adhere to a "one-size-fits-all" principle. study of vagina sizes using Magnetic Resonance Imaging (MRI) on 28 volunteers between 18 and 39 years old, with heights ranging from 1.5 to 1.7 metres (4 ft 11 in to 5 ft 7 in), and weights between 49.9 and 95.3 kilograms (110 and 210 lb), revealed a greater than 100 percent variation between the shortest (40.8 millimetres (1.61 in)) and the longest (95.0 millimetres (3.74 in)) vagina length. at the proximal vagina: 3.3 cm (1.3 in).Mean length from cervix to introitus: 6.3 cm (2.5 in).Research published in 2006 by Barnhart et al., gave the following mean dimensions, based on MRI scans of 28 women: also using castings as a measurement method, measured vaginal surface areas ranging from 66 to 107 cm 2 (10.2 to 16.6 sq in) with a mean of 87 cm 2 (13.5 sq in) and a standard deviation of 7.8 cm 2 (1.21 sq in) A 2003 study by the group of Pendergrass et al. They were also unable to characterize the vaginal shape as a "heart, slug, pumpkin seed or parallel sides" as suggested by the previous studies. Barnhart et al., however, were not able to find any correlation amongst the race and the size of vagina. Both studies showed a wide range of vaginal shapes, described by the researchers as "Parallel sided, conical, heart, slug" and "pumpkin seed" shapes. introital diameters: 2.4 to 6.5 cm (0.94 to 2.56 in)Ī second study by the same group showed significant variations in size and shape between the vaginas of women of different ethnic groups.using vinyl polysiloxane castings taken from the vaginas of 39 Caucasian women, found the following ranges of dimensions:

The opening to the human vagina lies just below the urethral opening at the back of the vestibuleĪ 1996 study by Pendergrass et al.