Do you think there's a relationship between how quickly you have sex with someone and the quality of a subsequent relationship?

There was a story on BBC today that it took me a while to track down. They said that early sex caused poor relationships. I finally found the study here, and as usual, the claims of the study are much more modest than the headlines say.

The study is about low and moderate income cohabiting couples with children. It is not about every relationship. We know that children cause pressure on all relationships, as do lower incomes. So I’m not sure the study says all that much new, but I am sure that the English paper (The Daily Mail) wrote a sensationalized headline that was quite misleading.

Still, I wonder if any of you have noticed a difference in your own lives depending on how quickly you had sex with a new partner, and the eventual quality of the relationship. What do you think?