its not any of these reasons.....recent studies and polls show that men and women brains work different ways......and every person is diferernt in their own right....
so their sense of touch gets wired with their sens of sight...dulling it down....
try this...if you touch something with your eyes open...you get less sense of touch than if you do it with your eyes closed.....
so instinctively some women AND MEN close their eyes....to better get a sense of the kiss......
besides....ppl's faces tend to get fat and ugly close up....