The majority of times 'sexual immorality' is mentioned in the Bible, especially in the New Testament it is listed in a list of 'sins.' Why? Because, a sin is a sin, there are not big sins or little sins. They all have an equal weighting to God, because we have turned away from him and his rule. And yet, the Church often portrays sexual sin, especially homosexuality, as a massive sin, when it's not. Therefore, as a sinner, how can I condemn someone else who sins? I can't. Because they could point out the places in my life where I sin. Whilst I believe being accountable to other Christians is important, mentally condemning others who I see 'sin worse than me' is wrong. Utterly wrong.

Why? Matthew says:
One of them, an expert in the law, tested him with his question: "Teacher, which is the greatest commandment in the Law?"
Jesus replied: "'Love the Lord your God with all your heart and with all your soul and with all your mind.' This is the first and greatest commandment. And the second is like it: 'Love your neighbour as yourself.' All the Law and the Prophets hang on these two commandments."
Matthew 22:36-40
Matthew 22:36-40
Because Jesus says that loving one another is the second most important thing, and how can I love someone if I always condemn them? I don't see that as love, through loving them I may talk about what I see as wrong in their life, but in all they do I should support them even if I believe they will be hurt in the end.
Lets say, my non-christian friend dated a guy with girlfriend. I would say it was wrong, but I wouldn't stop being her friend, and I would always be there to listen to what they'd done and then support her if/when he hurt her. Why? Because she's my friend and I love her, just because what I see she is doing is wrong doesn't stop me loving her.
In the same way, as Christians I feel we are called to love everyone, it Jesus loved the outcasts of society, and so we should also love everyone even if what we believe that the lifestyle they live is against that of the bible. Jesus spoke to prostitutes and tax collectors, his best friends were fishermen, and so, as Christians we should also reflect that love. We should love accountants and politicians, we should be-friend people for who they are rather than the labels that society gives people.
I don't know whether I want the bill for gay marriage to be passed, I can see pros and cons for each argument but I know whatever happens I am called to love other people for that is what God has called me to do foremost.