I'm only like that with books. I have a favorite movie, video game, album, band, and comic, that I can point to as the biggest single influence on me out of everything in that category, but I don't have a favorite book. A lot of different books have influenced me in small ways.

That's a strange question to have by default. I'm guessing that the service skews older, but even older people haven't all been married.

I once had to answer a survey in a dance music magazine that included the question "do you use condoms?". That also struck me as... not the most inclusive.