You also often hear, sometimes from Christians, that the Old Testament prohibitions on homosexuality are just like the ceremonial laws that the ancient Israelites had to observe, with dietary restrictions, and restrictions on wearing clothing made of different fabrics. These Old Testament laws no longer apply.
Careful hermeneutics will help you to understand that the ceremonial laws served a purpose that is no longer needed, because they were abrogated by Christ. The moral laws remain. Like it or not, any expression of sexuality outside of monogamous, opposite sex marriage is a sin in the eyes of God.