In general, nothing wrong with it at all. It won't do you any harm. It is quite normal and natural.
If done excessively it could interfere with your sex life with your partner, if you have one. Firstly, you can only orgasm a certain number of times per day (and that number tends to reduce as you get older), so if you've already masturbated several times one day it'll be harder to reach orgasm when having sex with your partner. If you masturbate too much there is a possibility you end up prefering that to sex, and that could damage your sex life and your relationship.
Also it upsets some women (not all) to know that their husband/partner masturbates at all, even if they still have a good sex life together.
But apart from these issues, there's absolutely nothing wrong with masturbation!
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