A powerful tool you have to master in order to have great sex is eye contact. Eye contact is a key element of human interpersonal communication, but often during sex many people have conditioned themselves to avoid it.
You may have been together for years, but admit it - how often do you really look at each other in the eyes? I have seen many couples keep their eyes shut during sex, which may result in disconnection, and as you know sex is always more powerful when there is a strong connection between two people. Among other things, prolonged eye contact causes the body to release phenylethylamine, a chemical that increases feelings of attraction and makes a person feel in love.