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The penis swells with blood. It gets bigger and harder and it rises up. A woman who is aroused gets a wet vagina. This helps the penis to enter the vagina.
In this segment of the episode, testers attached cameras to one of the woman's nipples, the man's penis, inside the woman's vagina, and both.
The images obtained showed that during intercourse in the “missionary position” the penis has the shape of a boomerang and 1/3 of its length consists of the.