Ok, final consecutive post, I promise
, I found the article, she doesn't give an exact date either just the Patriarchate (after all, she's specifically talking about Adoption, not Adelphopiia in this article). But she does give a reference for those who would want to look up the acts of the Synod of Constantinople in question (I don't have the source and even if I did I wouldn't want to spend an hour typing out the acts in Greek, but you're free to look it up).
V. Laurent, Les regestes des actes du patriarchat de Constantinople
, I, 4 (Paris 1971), no. 1762 p. 541; no. 1777, p 554.
I remember this work, great source, editor's comments are in French but the vast majority of it is simply the original sources in the original Byzantine Greek. While Macrides thinks Boswell goes too far in calling it 'basically a gay marriage ceremony for the Greek church' she finds compelling evidence from the acts condeming it that it was at lest used for that by many who participated in it (as well as for easy and initmate access, in private, to members of the opposite sex with whom you were not married).
If anyone's interested in Boswell's work, she references:
J. Boswell, "Rediscovering Gay History: Archetypes of Gay Love in Christian History," Michael Harding Memorial Address
(London 1982, repr. 1985), 5-21.
I haven't actually read that article, so I can't comment on it one way or the other.
But, there you go, at least now there's an academic basis for this discussion.