Side A, Side B, Side X, Side Y
Sides A, B, X, and Y are labels used for theological positions on homosexuality within some Christian churches and communities. In general, those who affirm same-sex marriage fall under "Side A", while those who do not affirm it are classified as "Side B", "Side X", or "Side Y".
Source: Wikipedia — Side A, Side B, Side X, Side Y (CC BY-SA 4.0)