Same Sex Marriage

Why is the Catholic Church involved in the same sex marriage issue? Does this have to do with civil rights? Does the definition of marriage really matter? Redefining marriage won't affect me - or will it?

Marriage is a personal relationship with public significance. Marriage between a man and a woman transcends cultures, religions and all time.

Marriage is about more than two people who love and are committed to each other. It also is about creating and nurturing the next generation. As natural law and biology dictate, this requires both a man and a woman. They are not interchangeable. You cannot redefine biology.