Too bad we must rely on Paul, and not an apostle.
Paul was an Apostle.
Paul was an apostle; he had his conversion on the road to Damascus when Jesus appeared to him and blinded him. At that time Paul was Saul, persecutor of Christians.
A lot of liberals discount Paul, as he was not one of the apostles who actually walked with Jesus. The problem there is that Peter specifically says that Paul's letters are to be given the same authority as Holy Scripture.
Hard to get beyond that one.
But for me the biggest hurdle (for liberal christians-small c) is that Jesus IS and WAS and IS TO COME, which means that he was there from the beginning of time as the Godhead, and therefore just as forcefully condemns sexual immorality (pornea in Greek--where pornography comes from. This covers all sorts of sexual immorality, including homosexuality, incest, adultery, fornication, etc.)Since Jesus IS GOD and DOES NOT CHANGE, they have a real problem. Their problem is that they continually judge scripture, instead of letting scripture judge them.
Scary and sad situation to be in.