There would be nothing wrong with using a banana to masturbate, if your a female using it for vaginal masturbation u need to be careful with using different objects, as it may cause thrush, itching or burning or may even become inflamed because of the reaction your body has taken to the object. also fruit like bananas have all sorts or things A Reddit thread reveals that young men are jacking off using banana peels. Sexual health experts recommend using masturbation sleeves instead.