What can change the response of sensory nerves to tactile stimulation in the pubic area?

    a.    Nothing. The responses of peripheral nerves are fixed.
    b.    Absence of other tactile stimulation increases the responsiveness in the pubic area.
    c.    Simultaneous stimulation of visual or auditory neurons increases the responses to tactile stimuli.
    *d.    Estrogen increases the skin area that stimulates nerves in the pubic area.