Gross oversimplification in the spirit of ELI5
The nature of addiction is to release happy chemicals that you depend on to feel good.
For many, seeing or experiencing something new or naughty releases the happy.
But, especially for men whose sexuality tends to be visual, once you have seen or experienced the thing, it is less powerful in the happy chemical next time. And less and less.
Because our imaginations can be stronger than reality, this means that it can soon become the only way to feel the happy chemical.
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