(another major contribution to the thread)
Guys, Thanks a lot for this joyfull thread, I wouldn't expect this to turn out like that! I laughed so much...
I answered yes, mostly because of what Devitto and Totoro have already said. All the more that if you don't even consider the idea of marrying someone someday (and I don't talk about people who won't marry someone for religious reasons). As someone already said, marriage is only an option (at least for me / in my country).
Unexpectedly, it's interesting to read everyone's answer, it tells a lot about our values. I'm probably wrong, but it seems the younger you are, the more you tend to answer no to the question... Don't know if older people tend to be desillusionned about the matter.