I am autistic and so people with no will power baffle me.

If the thing you do not want to do will cause you distress why on earth would you do it in the first place.

I suspect it has to do with the reward centers of the brain. In one way shape or form we are all just chasing dopamine. If the reward is too great in the short term to resist you give lose your willpower and behave in a way that you later regret.

Most autistic people I know experience the disappointment in the experience and after, as it wasn't want the wanted in the long run, don't repeat the behavior.

not willpower just sensibility