St Paul, in his second letter to Corinth, spells this out further in the important eighth and ninth chapters, where he urges some of the Christian communities to be generous to others so that they may also have the chance to be generous in return.
It is not every man that can afford to go to Corinth.
There wasn't reparative therapy in Corinth. So in this passage I think people came to Christ and experienced a new life in him apart from the therapeutic process. But when it comes to someone pointing to this passage and saying homosexuals changed, well, I'm not sure that's what that passage is referring to.