You are still ignoring the context of time and culture.<quoted text>
Paul understood life as well or better as the next person. He would have well understood the difference between choosing to do something and being made to do something by others in higher authority.
So once converted to Jesus's gospel, I'm sure his speaking against sex outside of marriage was mainly meant for those that had the power to make their own choice and, weren't being forced to do something they might not other wise do. Don't you think?
I'm not saying they were forced to do anything. I am saying they were enculturated to believe they were pleasing the pagan fertility gods. They believed going to "church" and performing the rituals as they had been instructed was what the gods wanted, and by pleasing the gods, their lives would be better. While some were surely in full support, others surely were not. A modern comparison would be that many would rather stay home and watch the game, but they go to church because they were taught from birth it pleases God, and their parents and social group expect it from them as well. While willing participants, they are not always fully engaged.