Humans, unlike animals indulge in sexual activity not only for procreation but also to satisfy their basic sexual urges. Humans have sex as and when they please whereas animals copulate only during the mating season. In order to have sex as they please, the man should be capable of having a healthy penis erection.
A frequent doubt that has been quite commonly raised is till what age the penis grows and are there any age restrictions for trying out penile enlargement.