Plural marriages are a separate issue. This still involves consenting adults and name-calling won't change that. Loving vs. Virginia wasn't decided on the merits of how unique certain relationships are compared to others. It was decided on the principle that the state could not impose certain ristrictions on consenting adults who belonged to a specific group. That's illegal under the 14th and 5th Amendment. You and I may not agree with someone else's marriage, but we don't have the authority to prevent it.