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Jen What do you mean by needed
People with ADHD have dopamine deficient brains, the hormome levels are not the same as neurotypical people and so the brain needs more dopamine and often we seek things which give us more dopamine, which is often referred to as self medicating.. That can be masturbation, sexual behaviours, alcohol, drugs, very active sports, sugar, or adrenaline junkie type of activities.
The brain uses dopamine to feel good and to be able to focus properly. This is another reason why people with ADHD can hyper-focus on things that interest them. Liking a topic or activity can provide the extra dopamine which enables them to focus on it for a long period of time.. much longer than other people. But when they get bored in something they can't easily continue and go hunting for that next thing which they can hyperfocus on which gives them that burst of dopamine. We move from one hobby to another hobby regularly.