The spouse will never let the shame of the cheater go unpunished and the spouses fury will be never ending. Adultery, in some countries, is actually a crime punishable by death. Here in America, it happens all the time, unfortunately, and people often get away with it without either spouse ever knowing. But eventually the secret gets out when you least expect it and destroys a happy marriage. Sex before marriage is NOT needed at all to prove your love for another.
Love knows no bounds.
Love can not be defined by how great a person is in bed. Love is not questionable. Love is grand. Love is great. And Love is what we can receive through a lasting relationship with God.