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 Vaginal Satisfaction,Stimulation From Penis Length
It
            is not difficult to understand why larger (longer and/or thicker) penises
            cause more vaginal satisfaction than smaller penises. Everyone agrees
            that a vagina doesn't have many touch sensitive nerves passed
            the first third (see Alfred Kinsey's research). But these vaginal
            walls are responsive to deep tissue pressure. Both longer and
            thicker penises create more pressure in these walls.
 Why women prefer longer penises
              
                deep
                stimulation of back of vagina
                stimulation
                of uterus
                more
                friction along vagina walls
                allows
                any love position 
                penis
                won't slip out during heavy thrusting Most
            women agree
            that they prefer thicker over longer penises because often they feel
            discomfort or even pain when being penetrated by a long penis.
            Usually
            the penis isn't actually too long however. It is rather the fact that the
            
            vagina was not ready to receive a lengthy penis. A vagina needs to
            go through a few different stages before being ready for full penetration. When a vagina is in relaxed state (no arousal) the cervix rests at
            about three to four inches away from the vagina opening. The vagina 
            walls are collapsed against each other, leaving hardly any space in
            between. During arousal the vagina walls start to secrete a
            lubricant causing wetness and then the first few inches of the
            vagina expand a little, creating some space. Many guys take this as
            a sign that the woman is ready to be fully penetrated. Doing this
            with an average to long penis will hit the cervix frontally, causing
            discomfort or pain. 
                  
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 |  | Relaxed
                    vagina: 
 Woman's
                  reproductive organs in relaxed state. The walls of the vagina
                  are collapsed against each other.
 
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                    |  |  
                    |  |  Men often don't give the vagina the time to
            become "tented", meaning that the  cervix retracts in the body
            and the inner two third of the  vagina walls open apart. Only at this
            point is a woman ready to receive heavy thrusting, especially when
            the penis is long.
 
                  
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 |  | Tented
                      vagina: 
 Woman's
            reproductive organs in aroused state. Notice how the uterus has
            pulled upwards and frontwards (anterior), allowing the vagina to
            expand dramatically.
            This vagina is ready to receive a large penis.
 
 |  If the guy also knows how to  adjust his angle to
            make sure his penis doesn't bump the cervix directly, he can give
            the woman tremendous repetitive uterine orgasms. These are caused by
            the rhythmic stimulation of the penis glans against a region high in
            the back of the vagina, called the epicenter or E-zone. It is just
            above the cervix on the front wall of the vagina.
 
                  
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 |  | Penetration
            by a large penis (length 9+ inch) in an upwards angle, making the uterus tilt
                    backwards.
                      Notice how the penis causes extreme movements to the
                      uterus. 
 |  For most women only penises seven inches and
            longer can reach far enough to cause a uterine orgasm. Some women with
            shorter vaginas might be able to do it with a six to seven inch
            penis. The importance however is that the erection has to be hard,
            meaning that the penis has to point upwards higher than just
            parallel to the floor when standing up. The more it is erect, the
            more pressure it can create to the vagina wall, the more pleasure
            the woman will have.
 
                  
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 |  | Penetration
            by a small penis (length 4-5 inch). When the erection is very hard,
                    the penis will still give a lot of pressure and friction to
                    one side of the vagina. It won't be able to directly stimulate the
                    uterus and the back of the vagina however. 
 |  Women report
            that even if they don't achieve a uterine orgasm they still  enjoy
            the sensations caused by the  rhythmic movement of the inner vagina
            and the uterus. For most women any penis longer than six inches can
            reach deep enough to create at least such sensations. However, it is
            also clear that the shorter the penis, the less stimulation the
            inner vagina and uterus will receive. Longer penises also cause more vaginal
            satisfaction in the  first two inches of the vagina. This part is
            jam-packed with touch-sensitive nerves and a long penis causes more
            and longer friction during each stroke in and out. 
                  
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 |  | Penetration
            by a large penis causes heavy stimulation of the end of the vagina
                    and of the vagina entrance. 
 |  Other ways long penises affect her vaginal satisfaction
Long penises
             don't slip out as much as shorter ones
            during intercourse. A man with a lengthy penis can  penetrate a
            woman in any position he wants. Some positions are simply impossible
            for shorter endowed men, especially when the guy wants to do some
            heavy thrusting. Doggy stand is the worst because not only will a
            shorter guy slip out, he also loses a couple of inches in length
            due to the girl's butt cheeks. If the girl's shoulders are
            positioned lower than her hips, then the depth of the vagina
            increases since her uterus actually pulls the vagina due to the
            gravity. In this position even an average six-seven inch long penis
            won't reach the back of the vagina unless the guy uses a hooked
            ninety-degree attack angle.
             It is worth noting that
             sometimes a penis is so long that it
            actually causes less stimulation for one simple reason: As soon as
            the woman can't take the whole length, she loses out on the
            sensations that are normally caused by the  contact between both
            bodies during each thrust. More in particular it is the man's pubic bone
            and his slapping testicles that by repetitively thumping to her clitoris and
            exterior genitals create extra pleasure and will help her to
            achieve an orgasm.
            
            
             Next:
            
            Stimulation from penis girth
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