Our expert says:
The vagina is a potential space able to accommodate to generally most sized penises. The vagina can stretch to allow for a baby's head to pass through. In certain cases if the woman has a fairly small diaphragm and the partner is unusually large and on top of that she is anxious and thus not well lubricated, aroused and comfortable then penetrative sex could be uncomfortable and even painful.
I would suggest you try a good amount of foreplay ensuring that she is well aroused and lubricated and even add more water based lubrication to your penis. Attempt penetration in the woman ontop position where she is fully in control of the process of penetration as to the speed and depth of penetration. If she feels in control, not afraid of pain and is really well aroused she could come to discover the degree to which her vagina is able to accommodate to your penis.
If this does not work then I would suggest a consultation with a sex therapist.
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