Sebastian exhaled deeply. "Oh boy..." he said. He turned to Rosalie. "Well, in human culture, when a male human and a female human love each other, they form something we call a 'relationship'. When the relationship lasts long enough, the male may ask the female to undergo a human ritual called 'marriage' - this ritual starts when the man gives the woman a golden ring. The humans then go to a holy building we call a 'cathedral', and when the ceremony is over, they live together, and they might even have children sometimes." He took a breath. "So... my question is... are you in one?"