I had never heard of the "Iona Institute" before (it's a company set up in Ireland in 2006, with no links to Iona). I have heard of the Iona Community (founded 1938), though (and met quite a few of them, both on Iona and in Glasgow). Here is their statement on human sexuality:

http://iona.org.uk/2011/04/06/iona-community-statement-on-human-sexuality/#

The Community is likely to be around long after this "institute" is gone and forgotten.