This is also a common problem affecting young male population. There is a belief that bigger the penis, more satisfied the female is. Generally boys, while passing urine, may see the penis of the person near by or may see a macho man performing sexual intercourse in a porn movie. Sometimes people may brag about their penis size and sexual power. This can produce inferiority complex. Remember, people generally tell lies about their sexuality and porn movies are fantasy world. They should not be taken on their face value.