My husband and I also close our eyes when we kiss. There could be more than one reason for that.

First, the eye lids would automatically close to shield the eye when anyhing is brought physically too close to it. A sort of inbuilt bio-protection system. But of course one can intentionally continue to keep the eyes open. But when you do that with something at a very close range for a specified period of time, the retina cannot focus. Hence, the eyelid shuts down for the comfort of the eye.

Secondly, sight is one of the five human senses. The remaining four being...touch, taste, hear and smell. When any one of these senses or all of these senses are "closed" from receiving, it automatically heightens and enhances other nerve endings. Try this....place both thumbs against the little protrusion in front of your ear and close the sense of hearing. Next, use both index fingers to hold down the eyelids. Use both middle fingers to seal your nostrils. Use both ring fingers and little fingers to seal upper and lower lips together. Do this gently and observe how your body reacts.

Kissing excites the nerves in your tongue and lips, provided you remain in that region. By closing your eyes, you are reducing the functions of the other senses and increasing the flow of hormones within your brain. That creates a sense of sensual pleasure and excitement and physical satisfaction. It heightens the feeling of love as it becomes an expression of your feelings towards your beloved partner.

Muah mauh 100x!