does masturbation with pen cause any harm 8-|
Depends on the shape of the pen. Any sharp instrument, or narrow pointed instrument (pen), or sharp-edged instrument (ruler) has the ability to rupture skin and damage whatever it is that you're stabbing, rubbing or poking. Also, any top (eg: bic biro with separate top) that can become dislodged is obviously not a good idea.
Basically, if you wouldn't trust a friend to play around with it around your eyes, you probably don't want to play around with it inside your vagina. No one (that I heard of) ended up in hospital after being threatened with a banana. If you're not yet old enough or comfortable enough to buy safe and specially designed products (there are shops for women, and shops online) such as gel-vibrators or dildos, then use common sense, and find a soft or smooth surfaced object, blunt ended, that feels comfortable.
Basically, if you wouldn't trust a friend to play around with it around your eyes, you probably don't want to play around with it inside your vagina. No one (that I heard of) ended up in hospital after being threatened with a banana. If you're not yet old enough or comfortable enough to buy safe and specially designed products (there are shops for women, and shops online) such as gel-vibrators or dildos, then use common sense, and find a soft or smooth surfaced object, blunt ended, that feels comfortable.