Back before Internet porn got big, I had this really disgusting customer who got pornographic DVD's on what seemed to be a daily basis. He lived in a crummy apartment, didn't shower or brush his teeth or hair, and came to the door in filthy, smelly clothes that were....um....crusty.
One peak season, I got a young, attractive female for a helper. The first time she delivered a package to him, he got all worked up and horny and on subsequent deliveries he started making really inappropriate and disgusting comments to her. She finally complained to me about it, so I told her to wait in the truck while I made the delivery instead. The perv came to the door visibly aroused, and the look on his face when he saw my big ugly mug was priceless. He kept trying to look around me to see my helper and I kept moving to block his view. It was hilarious and gross at the same time. I felt bad for my helper, she was barely out of high school and a good kid who didn't need to be treated like that, but we both got a laugh out of it and had fun at that stop for the rest of peak.