HEALTH-FAM-HIV-COUPLES

Peter McLoyd and his wife, Kathy Jacobs-McLoyd, pray before lunch at their home in south suburban Matteson, Illinois, on November 19, 2010. They are among the nation's serodiscordant couples-or, more simply, "magnet couples" who are attracted to each other even though one partner is HIV-positive and one is negative. Living in such a relationship has its challenges. Jacobs-McLoyd entered theirs knowing her husband was HIV-positive, and she wasn+¼t sure she could get involved. (Photo by David Pierini/Chicago Tribune/Tribune News Service via Getty Images)