The fact that homosexuality was condemned shows that it was around.
As I pointed out on an earlier comment, homosexual relationships were condemned in the Didache.
You shall not commit murder, you shall not commit adultery, you shall not commit pederasty, you shall not commit fornication, you shall not steal, you shall not practice magic, you shall not practice witchcraft, you shall not murder a child by abortion nor kill that which is born.
70 AD
The Didache is among those traditions the Catholic Church recognizes that are not in the Bible.