Here's an idea from Tom Ackerman:
Yesterday I called a woman’s spouse her boyfriend.
She says, correcting me, “He’s my husband,”
“Oh,” I say, “I no longer recognize marriage.”
“How’s your longtime companion, Jill?”
“She’s my wife!”
“Yeah, well, my beliefs don’t recognize marriage.”
Fun. And instant, eyebrow-raising recognition. Suddenly the majority gets to feel what the minority feels. In a moment they feel what it’s like to have their relationship downgraded, and to have a much taken-for-granted right called into question because of another’s beliefs.
I don't think any heterosexual in America has really ever questioned his or her right to marry - or the expectation of social status it brings with it. This thought experiment helps jolt the mind into seeing the world through the other's eyes. Which is rarely a bad thing.