Except loving his stories in Othello, why did Desdemona marry Othello?

In Othello, Shakespeare presents two
different Desdemonas: the one in Act I is a rebel, defiant of her father; the one in Act
II is overly-compliant and passive toward her husband, martyring herself rather than
defying him.  So, Shakespeare gives us a vixen and a victim, and so it is difficult to
tell which Desdemona married Othello for his stories and which married him to spite her
father.

The Desdemona of Act I seems to be attracted to
Othello's "otherness."  She is white; he is black.  She is Christian; he was probably a
pagan.  She is young; he is old.  She may well have been a virgin; he, no doubt, had
experience.  All of this would have been done to spite her father, who--from his
dealings with Othello at least--is controlling and manipulative.  Her elopement may have
given her a sense of adventure, freedom from an otherwise "under lock and key" status in
a senator's house.

Brabantio senses her deception, as do
other men.  They realize she is good at tricking them.  As soon as Brabantio is told
that his daughter has eloped, he says as an aside:

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O she deceives
me
Past
thought!

Later, to
Othello, Brabantio says:

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Look to her, Moor, if thou hast eyes to
see:
She has deceived her father, and may
thee.

Iago even
says:

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She did deceive her father, marrying
you;
And when she seem'd to shake and fear your
looks,
She loved them
most.

It seems that
Desdemona has a rebellious streak once in Venice, but once she gets alone on Cyprus,
away from her father, she might have gotten in over head: her rebellion backfires.
 Suddenly, she is a toy to men (Iago and Othello), who use her as collateral damage.
 Rather than speak out, as Emilia does, she plays the part of a "good wife," by saying
nothing, even on her deathbed.

Shakespeare leaves her
character dubious in terms of motivations.  As such, she can be read more than one way.
 As a vixen at least, I believe, Shakespeare wants us to see an undercurrent of sexual
attraction to Othello.  She would never express this aloud in the play, nor would it
have been permitted on the stage regardless.  So, I'm afraid what she doesn't say--in
terms of motivation for marrying Othello--is more important than what she does
say.