His: I can take a sip of my husband's beer. I can take a sip of his coffee. I can share a Pepsi with him at the movies. But I can not so much as apply my lips to his glass of milk. The idea of drinking from someone else's, or (heaven forbid!) having someone else drink from his milk is anathema to him.
Mine: At yoga, I have to perfectly align the edge of my yoga mat with the planks of wood on the floor of the studio. If they're not just so, I will move out of a posture to correct it.