ORONTO, Aug. 30 — When David Andrew, a 41-year-old federal government employee, heard that the highest Ontario court had extended marriage rights to same-sex couples two months ago, he broke into a sweat. "I was dreading the conversation," he said, fearing that his partner would feel jilted when he told him that he did not believe in the institution. "Personally, I saw marriage as a dumbing down of gay relationships. My dread is that soon you will have a complacent bloc of gay and lesbian soccer moms." When he moved in with David Warren, a 41-year-old software company project officer,...