This study being coordinated by researcher Gabrielle Gotta compares responses to the same questionnaire from a national sample of lesbian, gay male, and heterosexual couples in the mid-1970s to a different national sample of such couples in the year 2000. The mid-1970s data originally were collected by researchers Phillip Blumstein and Pepper Schwartz at the University of Washington and are archived at Radcliffe College. The more recent data were collected by Esther Rothblum, Sondra Solomon, and Kimberly Balsam at the University of Vermont and have been given to the Rockway Institute for the present study. Comparing these two cohorts will shed light on what changes, if any, have occurred in these three types of couple relationships over the last 30 years in the United States.