Warnings: Some questions are NSFW.
Information: Feel free to use this, credit not necessary.
Edit Info: I felt like it should be updated to be more inclusive! Might be updated again, might not.
The Basics
How did they first meet?
How did they get together?
Who kissed who first?
What's the relationship like? Smooth? Rocky?
What do they like the most about each other?
What do they like the least about each other?
What are the dates like?
What was their most memorable date?
Domestic Questions
Who cleans the most? Contrary to that, who is the messiest?
Who usually cooks?
Who has the best table manners?
Who tends to worry the most?