With thanks to a demo user for this suggestion:

My Suggestion

I'd like to have a temporary 'blocker' that makes me wait at least a few seconds before I can continue with the porn. Even just 15 seconds.

It could say "Can you wait 15 seconds?!".

It would also be cool if I could change the length of time, so that if I have a good streak, I can make it just that bit harder to relapse.

Why I think it is a good idea

I think this would help me relapse less, simply by giving me that moment to reflect - even if that's just noticing the other things on the screen and getting a bit distracted.