A majority of men and women believe the family gets hurt when both parents work outside the home, according to a study by pollster Louis Harris. At the same time, "The potential impact of family life on work seems to be as great or greater than the impact of work on the family," because businesses will have to adapt to family demands, Harris' report said. The polling firm said companies "will come under increasing pressure to adopt more flexible benefits and work policies" to make it easier for employes to manage job and family successfully. The findings come at a time when more women are in the labor force. The Deparment of Labor says, for example, that more than half of all married women living with their husbands have paying jobs. As of March 1980, almost 57 percent of women with children under 18 were in the labor force; 53 percent of the children under 18 had mothers who worked outside the home. The survey on family attitudes toward work was conducted by Harris for General Mill, Inc. It consisted of interviews last November and December with six groups; 1,503 adult family members, 235 teenagers, 104 personnel executives from major corporations, 56 labor leaders, 49 traditionalists or leaders in the "pro-family" movement and 52 feminists, active in women's rights organizations. Fifty-two percent of adult family members, for example, said there had been a negative impact on the family as a result of both parents working. Twenty-eight percent said there had been a positive impact; 14 percent said there had been no impact at all, and 6 percent were not sure. Sixty-five percent of the labor leaders, 60 percent of the personnel executives and 100 percent of the traditionalists agreed that the impact had been negative. But 67 percent of the feminists said the effect was positive. Women who work outside the home were split. Forty-four percent said the impact was negative; 37 percent said it was positive; 14 percent said there was no impact, and 5 percent were unsure.