Formal equality requires treating relevantly similar cases similarly, but 'similarity' in intimate contexts depends on factors (chemistry, values) external to protected categories.

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Chemistry (in interpersonal context)(as used in discussions of relationships and personal connection): The natural attraction, compatibility, or emotional connection between two people that makes them feel right together.
Formal equality(in ethics and law): The idea that everyone should be treated by the same rules or standards, without exceptions based on who they are.
Protected categories(as used in legal and ethical discussions): Groups of people defined by characteristics like race, gender, religion, or disability that laws are designed to prevent from being discriminated against.
relevantly similar(The author's framing of the standard for comparing same-sex and opposite-sex unions in the marriage equality debate): Similar with respect to the specific values or functions under consideration, as opposed to identical in all respects

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