I don't know where it leads.  But the first step is for those who think they have THE ANSWER to figure out that they don't.  
There are some hints of how to turn to a new perspective:
**Andrew Hamilton said in his piece to bring to the fore the idea of "the unique value of each human being regardless of faith, worthiness of life, gender or sexual preference."  
**The rector of St Ignatius', Father Ross Jones, talked about the "order of reason" school of Natural Law, rather than a physicalist view:  "Presumably, same sex-couples, who make such a commitment to each other in good conscience, do so by reflecting on experience and on what it is to be human, using their God-given reason."   What is the "order of reason"? 

There is a lot more science and new perspectives that don't fit into the old way of seeing issues of sex and sexuality, Biblical or philosophical.  Maybe we start with asking so basic a question as "what does it mean to be human?"