This is what he is asking (I didn’t write it): “Does stimulating my anus gently when I “play with myself” harm me and is it bad to do it?”
Because of the many nerve endings in the anal area, many people find pleasure in anal stimulation. Gentle stimulation of the anus while masturbating will not harm you physically. More care is needed if inserting something into your anus- fingernails should not be sharp, and objects should never be inserted completely in. Whether or not anal stimulation is “bad” depends on your opinions on sex and what you decide is good or bad for you.