Question: Hello, I am an 18 year old girl and I'm worried about the depth of my vagina. I have read through the Q&A on your website about vaginal depth increasing after becoming sexually aroused. I don't believe this happens for me. When I masturbate and feel fully aroused, and am self lubricating, I can still only insert an object about 3 inches into my vagina before it hits my cervix. After that even applying light pressure to the cervix and continuing to masturbate doesn't seem to have any effect in lengthening my vagina. Even after I have reached orgasm it still does not appear to be lengthened! I am worried because I want to experience intercourse with my boyfriend, but his penis is much larger than the average 6 inches, and I know it will be a huge disappointment if it can only go in 3 inches deep! It is a huge disappointment to me as well. I want to be penetrated at least deeper than 3 inches. I don't know what to do about this, could there be some kind of hormonal problem? Or am I cursed with a shallow vagina forever?
Answer: You are not the first to ask about this, or to be concerned by how close their cervix is to their vaginal opening, i.e. the shortness of their vagina. Many women are surprised they can touch their cervix with their fingers, given their fingers are less than six inches in length, but a penis is six inches in length on average.
In a 1999 article about magnetic resonance imaging (MRI) of couples engaged in sexual intercourse that appeared in an issue of the British Medical Journal it states:
"In complete penetration the penis filled up the anterior [front] fornix* or the posterior [back] fornix. During intromission [penetration] the pubic bones of the men and women did not approach each other closely: the female pubic bone stayed about 4 cm [1 1/2 inches] cranial [above, towards head] to that of the male. The uterus raised by 2.4 cm [1 inch]."
"[During penetration,] In the pre-orgasmic phase the anterior vaginal wall lengthened by 1 cm [slightly less than a half inch] and the uterus rose within the pelvis."
"During sexual arousal without coitus [penetration], the position and size of the uterus hardly changed."
"However, we were able to see displacement of the uterus (upwards) and lengthening of the anterior vaginal wall and hardly any change in the position of the uterus during sexual arousal, unless it is caused by intromission [insertion] of the penis."
* "The fornix of the vagina is any of three vaulted [enclosed] spaces at the top of the vagina, around the cervix of the womb"
The size of the vagina is addressed in the below linked to Q&A on the website: qa_6/qa6_4.htm
This all means you are perfectly normal. You should not notice a change in the length of your vagina during masturbation. When the penis is inserted it tends to go in front of or behind the cervix, the cervix projects slightly into the vagina, and fills an enclosed space there allowing for greater insertion. The uterus moves upward during intercourse about an inch. In the missionary position the male and female bodies are separated by some distance meaning the full penis is not inserted; other positions allow for deeper penetration. The glans of the penis is soft, meaning it will adjust somewhat to the shape of the upper vagina and cervix. The shape and rigidity of the object you are inserting, and the angle it is inserted at, probably would not allow it to enter as far as a penis would.
While men prize the length of their penis, there is only so much room inside a woman's body for it. Many women experience pain during deep penetration, because internal organs are stretched or bumped.
During intercourse you probable will want to be on top, until your figure out how things work for you.
Attached (see below) is an image from the medical article mentioned above showing how the male and female bodies fit together during intercourse. The very white shapes are the bladders. The penis is clearly seen. Note that the uterus, which is located at the tip of the penis, is tilted back and is horizontal, in this case.
From: "Magnetic resonance imaging of male and female genitals during coitus and female sexual arousal" by Willibrord Weijmar Schultz, Pek van Andel, Ida Sabelis, Eduard Mooyaart. BMJ volume 319 18-25 December 1999. www.bmj.com
