For most people, porn movies are only a method to relieve stress, get relaxed after a hard day, or relieve sexual tension quickly without the need to reach out for a partner. In many cases, users do not consider porn as something specifically useful or practical for their life. They just watch the content they like and forget about it as soon as they get what they want.
However, porn can be very useful for those who have no or little sexual experience. This is especially true for adolescents and young adults who would love to have some sex experience and engage into relationships, but their being virgins undermine their confidence and they are reluctant to seek a relationship with people they really like out of fear to disappoint them.