Changes

The foreskin is a sexual organ.<ref name="hill2017" /> It provides both mechanical and erogenous functions in sexual intercourse, as well as [[pheromone| pheromones]].<ref name="fleiss-hodges-vanhowe1998"/> Winkelmann (1959) classified the foreskin as ''specific erogenous tissue''.<ref name="winklemann1959" /> When the [[penis ]] becomes erect, the foreskin unfolds to provide the skin necessary to allow the penis to expand to full size and length.