Hi Doctor, i masturbating from last 10 yrs from class 8th. working in night shift last 3yrs. usually I started masturbating, precum will come earlier stage, i use this as lubricant for for free movement. All masturbates and friends are frequently telling, backpain, neckpain, memory loss, etc... it means that due to masturbating right? is it right to use precum for masturbating? is it ok to masturbate for long yrs like 10-15yrs