It’s perfectly safe; as a matter of fact, it’s even healthy. Some studies have shown that men who ejaculate (whether through masturbation or partner sex) a minimum of 21 times per month are at a reduced risk of later developing prostate cancer. The only drawback with frequent masturbation is that it sometimes make your penis sore (although very happy!), so make sure you regularly use a top drawer penis health cream (health professionals recommend Man1 Man Oil) with a high end emollient like shea butter and a natural hydrator like vitamin E.
some tips; Do not masturbate with dry hands. use lubrication.
Do not stop breathing while masturbating.
Keep your perineum relaxed.
Empty your bladder while doing it.
Do not hasten ejaculation.
Do not use prone position.
Empty your bladder before you do masturbation.
Do not masturbate when you are over exited.
If enjoy masturbation fully, you will not need to masturbate often.
Hi Five times a week is ok , your not harming yourself at all , it's healthy and normal , take care ,