People do it because they are horny that's the main reason so if one does not have control of ones passions or lower faculties it's not uncommon for a human being of either sex to commit this sin.

The other reasons might loneliness, sexual frustration, porn addiction, sex addiction or it becomes a stress reliever in the same way people drink alcohol or smoke cigarettes.

Porn and society factor a lot in this sex isn't what people expect or want it to be with their spouses and they try to reenact a scene from a porno mag or video or a erotic book or something off television of film and when things don't pan out or their partners are not putting out or as much as they want they go and masturbate.

So basically people cheat on their spouses with porn or fantasies and in some worse cases live sex shows or prostitutes or free of charge affairs.

When you think about masturbation it is pretty pathetic of a person that they have to have sex with themselves or an image or fantasy or memory it should be classified as a form of mental illness really.

Who cares if apes and monkeys masturbate they eat other primates and fling and eat their own poop so I don't think we should take pointers from them.

Pray to God, Ask Jesus forgiveness every day, read the Bible go to confession every week and receive Communion weekly in a state of grace every Sunday Mass or daily if possible.
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Rev