Love the sinner, not the sin:

In a way, it's simple: Show them the same love and respect that Christ would show them. Jesus is down on sin, but not down on sinners. All people have sin in their lives, but that doesn't mean they have less worth to God. So no matter what sin people are involved in, they're still worth God's love. I would treat your homosexual friends the same way you would treat heterosexual friends who are sexually active. You can show love to someone without approving of what they do.