Sex inside the vigina. Sometimes the thrust of penetration hurts way inside.

How to keep erection during sex

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With one camera on the tip of the penis and another inside the vaginait's a completely new way to have sex — or at least, to view it.

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In some situations, size matters—if, for example, a male partner has a large penis and your vagina is small.

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A study found the average erect penis length to be just over 5 inches

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During arousal, more blood flows to the vagina.

Once the penis is inside, you can move your bodies so that the penis pushes into the vagina and then pulls partly out again.

Having adequate lubrication and communicating any discomfort to a partner can help keep sexual activity pleasurable.