A few weeks ago I read an msn.com article about emotional unfaithfulness between romantic partners; but the article did not grapple with the really troublesome issues such as the distinction between its subject matter and close friendship between persons of opposite sexes. Then I took a PF survey that had been posted by a postdoc researcher in South(ern?) Wales U. in Australia, which was about how a romantic partner (e.g. a spouse) felt about (or reacted to) a cross-gendered friendship between the other spouse and a 3rd person. Has anyone thought about or researched this (from a psychological or simply common sense point of view), and is able to suggest answers (or further reading)? The answer does have practical importance for me, as it may for others.