Kindly wash. If you're going to the movies, don't spray yourself with perfume, and especially not at forcefield volume. And kindly don't brush your hair or trim your cuticles in a place that serves food. In a word, EEEUW!
And then, how about if you, um, leave a stain of a personal nature on a friend's furniture? Has that ever happened to you?
Talk to me about your experiences in this arena!