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. He loves you more than anything you can consciously comprehend. He is there for you now, and is standing at your door and knocking. Please let Him come into your life and give you the love you need. And then you will really know what Love is.