Leaving a cock ring on too long (more than 30 minutes, or after the penis starts to numb or pale) can cause major damage to the penis. Penis pumps are safe as long as you don't have a congenital bleeding disorder, but may cause minor bruising or decreased ejaculate volume. Avoid both devices if you have an injury to the genitals, or a condition that puts you at risk for priapism.
4 - Use a moisturizer on the penis before the exercises and it is preferred not to use soap and shampoo as these materials will lead to redness and irritation of the penis skin . If it stays for a long period of time, in addition to dry skin, and the occurrence of cracks, it is preferred to use the Intensive Care Vaseline instead of the ordinary Vaseline as it can stay on the skin for long period of time without irritating or damaging the skin of the penis.