You answered correctly: C

The INNER FORESKIN is a combination mucous membrane and skin, joined at the head of the penis, that underlies the outer foreskin when the foreskin is not retracted.
It is the partial mucous membrane of the inner foreskin that gives the inner foreskin a moist, shiny look.
The inner foreskin is only exposed when the foreskin is retracted (e.g., during an erection). The inner foreskin slides out from under the outer foreskin, as the foreskin unrolls as it is being retracted. The inner foreskin layer contains many nerve endings that respond to gentle touching during the early stages of sexual arousal. This helps to trigger an erection. The nerves of the inner foreskin contribute to the experience of penile stimulation, up to and including orgasm. These receptors are stimulated by stretching, and by the sliding of the foreskin back and forth of the head of the penis.




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