We'll have to base it on sex then

In the movie Speed, Sandra Bullock's character says relationships that are based on a crisis situation never work out.

Annie: You're not going to get mushy on me, are you?
Jack: Maybe. I might.
Annie: I hope not, 'cause you know, relationships that start under intense circumstances, they never last.
Jack: Oh yeah?
Annie: Yeah, I've done extensive study on this.

Of course, she disregards her own wisdom when she starts making out with Keanu Reeves at the end of the film, but let's ignore that for a minute.

Why might a relationship based on a crisis not work out? For one, following a stressful situation, both parties are running high on adrenaline, a feel-good endorphin that makes your heart race and your palms sweat. Your body also releases adrenaline in the second stage of love, which gauges your attraction to another person. That means what you feel following a crisis could be confused with attraction toward another person, especially if he's of the tall, dark and handsome variety.

In addition, if you base a relationship off of a few hours you spent with another person during a high stress situation, you probably don't know that person very well. Granted, you know how that person responds under pressure, but what about their likes, dislikes and morals? These are all things that should be considered before starting a relationship, not after jumping into one.

The fact of the matter is, if you start a relationship with a firefighter who saves you from a burning building (or a runaway bus), chances are it's not going to last.

Do you think relationships based on intense situations can ever be successful? Have you ever fallen for someone who helped you out during a stressful time? How did it work out?