SAN DIEGO, Jan. 14 (UPI) -- Studies of lesbian and gay couples reveal some key factors that may promote healthier relationships in straight couples, a U.S. psychologist says. Psychologist and researcher Robert-Jay Green of the Rockway Institute and of Alliant International University in San Diego says the studies of lesbian and gay couples found that the homosexual couples had flexibility about gender roles and an equal division of parenting and household tasks. In a series of studies Green conducted with Michael Bettinger and Ellis Zacks, lesbian couples were found to be emotionally closer than gay male couples who, in turn,...