Eyes closed is the way to go. It can really help you shut out the world and focus only on the kiss. Also, kissing with your eyes open can weird out a guy, if he happens to catch you doing it. It is considered, as guys who kiss with their eyes open are usually thinking of something else besides you. If you catch your partner kissing with eyes wide, be careful - he might not be good boyfriend material.
Ako kc minsan i open my eyes, when we're already kissing, sometimes i open my eyes and shut it again to make the kiss more romantic and erotic......try this, mas maging exciting yung kiss nyo,,,,,......