I think everyone has their own definition of right and wrong. You can see that in all the responses so far. It can be based on many things. Some are based in their own experiences, things they've read or heard or seen. That foundation reflects in how you view the world. I believe that the Bible was written by God for all of us. My views, that I mentioned earlier, come from that viewpoint. As mentioned in that video, homosexuality is no worse that drunkenness, lying, murder, etc. They are all sin.
Have you noticed that everyone seems to have a inner sense of right and wrong. Where did that come from? For those that believe in the "Big Bang", maybe a piece of cosmic dust got mixed into the first cell. How can a few inert particles lead to a moral compass?
I believe that God put it in us when we were created. Makes sense, since my views are based on my understanding of the Bible. I can't force my views on anyone, nor should I. Not my kids, or friends. Everyone has to decide for themselves, what they believe, and why.
But I like that we can talk about it.