Andrew Huberman· PhD
So what it does is the cervix moves up and out of the way. The inner one third, two thirds of the vagina lengthens and elongates to allow for penetration, and it can actually nearly double in size of the baseline vaginal length.
The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
So what it does is the cervix moves up and out of the way. The inner one third, two thirds of the vagina lengthens and elongates to allow for penetration, and it can actually nearly double in size of the baseline vaginal length.
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With sustained sexual arousal, the uterus lifts and the cervix retracts upward and back (called vaginal tenting), increasing vaginal length and reducing vaginal pressure on the cervix.