Well, I do and it is NOT a sin to live together OR to have sex.Wrong again. It is not a sin to live together. It is a sin if you have sex. You don't know much about my operation so I understand.
God's law is to treat others as you would want to be treated. Violating this is a sin. Having sex, even if you aren't married is not a sin. Sexual harassment, rape, molesting a child, THESE are sins. A non-married couple, gay or straight, having consenting adult sex is NOT a sin at all.