Hey Susan,

Just curious, can over-masterbation do you any harm? Such as stunning your physical/penile growth?

No such thing as over-masturbation. Masturbate as much as you want.

Physical harm? You could make your penis very sore.

You could be missing out on social activities, family gatherings, schoolwork, working,eating properly, sleep or taking better care of your health. That's the real harm. If every spare minute of your life is hung up on self-pleasure, I would call that excessive.

It is important for each person to know exactly how much masturbation/ sex their body really wants/ needs and not to surround their entire life around sex, but to mix it in with normal activities that are needed for a well-rounded person...
So right time, right place is really rather important.