How is the frustration from PMO any worse than the frustration an artists feels sitting in front of a blank canvas, or when he struggles to get a piece just right? Both activities feel rewarding, and both consume energy. Same goes for exercise.

Also, how can you say that the pleasure gained from PMO is exclusively the relief of self-generated frustration? I do notice that the first few minutes of PMO are always frustrating for me, and that MO (without P) doesn't have the same kind of high that the O with PMO has, but these are just correlations. You can't attribute causation like that.

Sex irl also involves a build up of tension, that's why foreplay exists. Why is that okay and PMO not?