The first question is an awkward one. I tend to think of it in terms of the sort of distinction that Jesus makes between those who are included and those who are excluded, who find themselves in outer darkness where there is wailing and gnashing of teeth. The imagery suggests the sort of anger and resentment felt by those whose world has been taken over by the new Christ-honouring regime and “priesthood”. I realise Jesus is speaking of Israel, but I think this sort of social-eschatological schema can be transposed to the Greek-Roman world. Certain groups, certain individuals, will be excluded from the new ethical-religious order. But clearly the point needs to be developed.
My argument is that Paul does not ground his opposition to same-sex relations in the creation accounts. It is bound up with the “later” repudiation of the creator God by the Greeks and the development of their characteristic idolatry. Besides, most men who engaged in homosexual practices would also have fathered children; pederasts typically went on and got married.