I found this to be very interesting. From Women’s Health Magazine:
Your honey’s face has healing powers. In a study conducted by the University of California at Los Angeles, women were asked to endure pain while either holding their partner’s hand or looking at his photo.
Surprisingly women rated their pain lowest while viewing the photo.
Why? Viewing your honey in pixel form causes the brain to release chemicals that reduce pain. But holding his hand may make you worry that he’s evaluating you, which can heighten your nerves, making you more sensitive to pain.