text: is there any disadvantage of masterbution?   check this question here in answers (,has been asked a thousand times ),write masterb*ting in that little search window in your q&apage and you will see many answers about this,and all your fears or guilt  feelings will disappear,  whatever you do with whom or with what is ok as long as you dont hurt anybody and if it is with another person you should be of the right age, like older than 15 maybe.