I'd launch into a furious academic debate about the merits of the porn in question, why its inherent objectification of the characters involved is perfectly fine and the merits of free access to legally produced porn (not free monetarily) is a good thing for society! I would continue these arguments as if I were engaged in formal debate or giving a lecture, growing ever more passionate about the points in question as I lumbered, privates still-in-hand, toward the invader, at once threatening to overwhelm them with well reasoned arguments or else the frightening image of me jerking it wildly as I orated like the pastor of a Mega-Church on Sunday. Upon their inevitable retreat, I would give chase, following their fleeing form down the street and increasing my volume until it seemed as if the Gods of perversion themselves were given form and I was their avatar!