Have you heard of the "AFE zone"?
Check it out here:
From:
The AFE – Zone and Erotic Pleasure
"Technically, the AFE Zone is a vortex of the nerves that carry information from your whole genital to the spinal cord and brain. These nerves, when stimulated, send arousal signals to the part of your nervous system which enhances engorgement of appropriate areas, and is responsible then for sexual arousal."
