For many men the frenulum and the perineum are the most sensitive part of their body for sexual pleasure. Researchers asked 81 healthy men to rate the erotic sensitivity of different areas of their bodies, including certain parts of the penis, the scrotum, anus, nipples, and neck. The underside of the glans and underside of the shaft had the highest sensitivity rating for a significant majority of men, followed by the upper side of the glans, left and right sides of the glans, sides of the penis, upper side of the shaft, and foreskin (for the minority of men who were uncircumcised).
The study findings were reported in the British Journal of Urology International in 2009. With more than 16,585 answers, the research has since been continue by Mr Cox of the Brotherhood of Pleasure in London. See survey below.