Sept. 26— On your wedding day you assume you'll have a long future together filled with love, intimacy, maybe kids, and of course, sex. Cheryl Wolfe assumed sex would be part of her marriage. Watch John Stossel's full report on 20/20 this Friday at 10 p.m. She was mistaken. "Marriage was never consummated … The day we got married there was no sexual relationship at all, no honeymoon night and from that point forward — nothing," Wolfe said. She isn't alone. Marriage therapists estimate as many as 20 percent of couples are mired in low-sex or no-sex marriages, and surprisingly...