Usually the man will hold the penis (in erection) in his hand and move the hand up and down.
Sometimes a lubricant is used to create a softer sensation.
Masturbation is when a person touches their own sex organs to have pleasure. Masturbating may be done alone, but can also be done with another person. Vibrators and dildos can be used to make masturbation easier or feel better, but it is often done with just a person's hand.
Studies have shown that a large number of people masturbate regularly.
Most boys start masturbating between the age of 12 and 15.