I was thinking about your question, and in a biological sense yes.
But it all really depends on how you perceive love, not whether it's chemical response.
"Love" in the animal kingdom is a physical reaction to furthering the species.
But human beings are way more complex than animals.
Yes marriage was intended for procreation, but how do you get to that stage?
Love is what drives people to get married.
This question is a really good question, but there are so many possible answers.
Scientists will say it is. Diehard romantics will say it's not.
I personally think it just depends on how you see it.