Not everyone is partnered, and perpetual semen retention may be harmful according to some sources; regular release is beneficial—for some it’s once or twice per week, for others it’s once a month or once every two months, etc.
Adult entertainment is a stimulant to make the act more enjoyable , and some couples enjoy watching it together. Adult entertainment is real work, and not all of it is filled w/ degradation, etc. A lot of movies are quality and made ethically with sane, grounded models (male and/or female) who genuinely enjoy their work.
As @Hidden_God stated, it’s all only a problem if it becomes an addiction that interferes w/ somebody’s overall life.