The foreskin covers the end of the penis and can be pulled back so that the tip or head of the penis emerges. In some countries and cultures (such as Jewish and Muslim cultures) it is normal to remove the foreskin when the boy is a baby. See circumcision.
Similarly, the glans, (or head) of the clitoris has a small foreskin, and is situated where the inner labia meet in front of the vagina.