A vagina can be compared to a thick sock stuffed with a soft hand towel squeezed by two hands. The sock is the vaginal tract while the soft towel material represents muscles surrounding the vaginal tract. The hands/palms represent pelvic floor muscles that hold the vagina in position.
One thing everyone needs to understand about the vagina is that, it is made of elastic muscle tissues that are folded tightly. These muscles work in an almost same way as muscles in the mouth, or an accordion. These muscles make it possible to stretch the mouth towards the ears, but enable the mouth to snap back to its position when released. Doing this repeatedly doesn’t affect the mouth’s form and structure as the stretching isn’t permanent. The same happens with the vaginal muscles; they expand and contract depending on the condition or situation.
Although vaginal muscles work in an almost same way as an accordion, a few alterations make them somewhat exceptional. These muscles remain contracted (tightly folded) until one is aroused sexually or moments before childbirth. If one becomes anxious, these muscles tighten making it almost impossible for anything to penetrate through. This is the reason why young (teenage) girls find it very hard to insert tampons in their vagina as their body is tense.
On arousal, these vaginal muscles relax a little in readiness for a penetration. The reason why these muscles relax is because the brain translates this as a signal to facilitate reproduction. The relaxed muscles make it possible for one to take in a penetration with ease, thus making a sexual intercourse possible. A tight vagina on the other hand hampers intercourse thus reducing chances of conceiving.
Although the tissues around the vagina relax to accommodate a penis, the muscles control how ‘loose’ the vagina will be. The vulva how expands to accommodate the penetration regardless of size. These muscles expand to accommodate a ‘bigger’ penis while it contracts to put up with a ‘smaller’ penis as well.
A few instances make a vagina feel ‘too tight’ during sex. A, extremely tight vagina implies the woman isn’t interested in sex, or you (the man) rushed the foreplay meaning she wasn’t ready enough for penetration.
The most interesting thing about sexual arousal is that, it not only induces relaxation of vaginal muscles, but also increases vaginal lubrication. Lubrication enables one to penetrate with ease without ‘hurting’ the woman or making sex painful due to intense friction. Studies reveal that, a woman can take up to 30 minutes to be fully aroused. This time can however be reduced by massaging the vagina, kissing or touching her gently. Giving your woman some time to be aroused fully gives the vaginal muscles time to relax, expand, as well as facilitate proper lubrication. Some women, however, take too long to produce the natural lubrication, which is the reason why you are advised to use a commercial lubricant instead.
Extreme vaginal tightness can also be because of vaginismus, an infection that makes muscles around the vagina to clench. See a physician if you experience painful penetration regardless of proper foreplay.