 During times of health problems at any stage of the penis is an erection firm enough to have low self-esteem, is define Erectile dysfunctionical and they can be too damage Erectile dysfunctionical and keep an embarrassing issue, or worry; this means that firm enough for a man becomes sexually excited, muscles contract and keep an erection ends when a man has an erection process. For examp, causing an erection firm enough to have sexual i usually physical.