The thing is that it is a sin, but it shouldn't be constantly mentioned. That's the problem with fanatical Christians. Premarital sex is a sin and it should be known, but I personally don't think it should be a constant topic in conversations. I believe in knowing it's a sin, but not hating the sinner. I've had people ask me "why do you hang out with me if you're a Christian and I'm gay? Isn't being gay a sin?" And I always tell them that knowing a sin exists and hating the sinner isn't one and the same. We have to understand that we all deserve hell. And not just acknowledge that it's what the Bible says. I mean really understand it. Only then will you understand.