Intimacy includes physical, emotional, and intellectual closeness between partners. True marital intimacy usually involves being honest with your spouse and allowing yourself to be vulnerable. Because you know your spouse well and trust him/her not to hurt you, you are willing to give yourself completely and risk the unknown. While there is no way to measure the amount of intimacy in a marriage, partners tend to know when intimacy is appropriate and when it is not.
Intimacy is the measure of how known and loved you feel by your spouse. You cannot gauge your intimacy by comparing your marriage to other marriages - each marriage is different and builds intimacy in different ways. There is emotional intimacy and sexual intimacy, for example - and many different ways to build each of these types of intimacy.