The Tunnel of Love

The "tunnel of love" was a carnival ride commonly found at amusement parks during the early twentieth century. It consisted of two-person boats that travelled along a narrow waterway through a dark tunnel. During a time when public affection was forbidden, it gave lovers the excuse to cling to each other. When you entered, it could be frightening because you didn't know what you would experience along the way.
 
It is a metaphor for real-life love. When you enter that ride, you don't know what to expect, but it can be exhilarating. A series of ups and downs and twists much like every relationship goes through. But sometimes, just as we begin to feel that we're stuck in a rut and/or reaching an impasse something happens that turns everything upside down and actually makes our love life far more exciting and enchanting.