I want to try to conduct an experiment where I test various methods of lasting longer in bed.

I think I can control for variations in the feeling by using an automatic machine to jerk me off, but I'm wondering about the porn I should watch. Should I vary it so that there's a constant level of novelty? Or should I watch the same thing every day in order to control the variable that way?

I'm serious about this. Not a degenerate coomer, just genuinely want to know how to be better at sex, and turning to the scientific method to solve my problem. I think this is something people would be interested to know the answer to.