Man who responded to Craigslist ad for a sperm donor is a dad, must pay child support, judge rules

William Marotta didn't intend to be a father when he responded to a Craigslist ad for a sperm donor in 2009, and the two women who sought one didn't want that result, either. But, because they didn't have a physician perform the artificial insemination procedure, the written waiver of his…