Hello, Masturbation is perfectly safe and a good healthy practice. Never attach any guilt with it. It is always best to masturbate with your fingers instead of using external objects. These objects and specially if you masturbate vigorously,can damage your internal parts. But a gentle masturbation will never cause any damage inside. Basically one should masturbate only if you are sexually aroused and not as part of daily habit or a compulsive habit. As explained above,masturbate occasionally and specially when aroused and don t make a habit of doing repeatedly in a day. Thanks