Thank you your candid reply.
I had one friend, a practising Christian who I suspected might be homosexual as he shared a house with another man although they had their own living areas. I didn't really want to know and he never referred to it. He is dead now, RIP.
I disagree with you about what constitutes a core teaching. The Creeds were composed to ensure uniformity of belief in response to heresies. 
It is only recently that Christians began to question the Moral Law regarding sexual activity. Up to 1930 there existed core beliefs on sexual morality not restricted to the Catholic Church but throughout Christendom and beyond. The Church, therefore, did not need to codify in creedal form what was already contained in the Scriptures and not seriously contested. It is only since early last century when the biblical proscriptions on sexual behaviour began to be challenged that papal teaching has become more focussed on such issues.