Please help improve this article by adding citations to reliable sources. Similarly, studies suggest that many men have an exaggerated idea of what constitutes "normal" penis size. This exercise is important in controlling ejaculation. If swelling continues, it may lead to an atrophy of the penis and then to an erectile dysfunction. You can start it by sitting in a comfortable place, then you have to warm up for strong contractions, and then hold the penis tightly for 10 seconds and after that do PC flexes, and when you reach to the last PC flex, hold it as long as you can, then take a rest for 3 minutes, and follow this with 40 strong PC flexes. Stretch the sides of the penis by holding the head of the penis as mentioned above, then pull it to the left and hold this position for 15 seconds and repeat this process 5 times and do the same in the right direction.