This is an erogenous zone. This part joins the head with the shaft and the shaft joins the testicles below. Another erogenous zone is at the base of the shaft. They are covered by a protective and supporting skin called a scrotum. Beneath this is the area referred to as the perineum.
Most male have a small indented area there that is an erogenous zone.
Stimulate erogenous zones by using your fingers, knuckles, palms, hands or fists. Also use your tongue and lips to explore them. Knowing his erogenous zones, you want to keep them in the front of your mind at all times. Make two fists over the head of his cock. Applying the heel of one palmed fist, slide your fist down over the head of the cock and apply the second fist directly after.