In an episode of
Curb Your Enthusiasm (Curb Your Enthusiasm has got to be the funniest show on earth), a guy who used to be in the porn industry tells a story about when he was getting soft during a scene, and a crew member ran to the food area, covered his finger in tabasco sauce, and stuck it right up the guy's butt. He said it made all the blood flow to the area and he was hard as a rock for another hour.
I wonder if anyone has actually tried this? It sounds like it would hurt a lot. I don't recommend trying it just imagining how much it would hurt. Then again, it might make for some kinky fun?