It’s bad-mannered kissing with your eyes open... kiss signifies many signs like respect, admiration politeness, welcoming etc. Kiss is the first step of every romantic moment. You will not kiss as well if your mind is somewhere else. i.e. when kissing, try to avoid thoughts like "What is he/she thinking about?", "Do I look good tonight?", or anything else. Don't be too self-conscious, or have ANY thoughts outside the kiss if you can help it. Instead, concentrate on the way the other person's lips feel against yours. So with just this little note I want you guys to be convinced that KISS whole eyes closed it nothing but the rule of good emotional and expressional act.