This is something I’ve thought about myself. Generally I find that I stutter way more, but have gotten to the point where I’ve held off TOO long, and it’s starting to make it worse, so I need to get the poison out and then I’m back to normal. Oddly enough, I find that it gets worse a lot less if it’s sex instead of masturbation. I do think there is a level of placebo effect as there have been times I did, forgot that I did and then had a very fluent day.