The Zina(adultery) of the limbs

The Zina (adultery) of the eye is the (lustful) look,
the Zina of the ears is the listening (to voluptuous talk),
the Zina of the tongue is (the licentious) speech,
the Zina of the hand is the (lustful) grip,
the Zina of the feet is the walking (to the place where one intends to commit Zina)

[Recorded by both Al-Bukhari and Muslim]