personally, i think it's normal to masterbate
it's basically like scratching an itch, if you know what i'm saying. the only reason that it could be bad is if you do it excessively, but doing anything too much can be bad for you, even evercise, eat, sleep, all these things in moderate is actually good for you.
the only reason i'm interested in this topic is that so many chinese (especially girls) have misconception about masterbation, and i would like to know why. it's not wrong to let out these sexual urges rather than having all that bottled up or going out for an "one night stand" or getting a bf/gf just to release that sexual tension.