Advice on a table structure

Hi,

I have one table that stores data about persons with fields like:

---------------------------
PERSONS TABLE
---------------------------
* Id
* Last name
* First name
* Gender
* Marital status
and other information that relates to a single person.

One person might have a husband if female, or a wife if a male. So I
thought about adding a table that associates couples like this:

---------------------------
COUPLES TABLE
---------------------------
* Id
* Husband (represents an Id of PERSONS table)
* Wife ( represents an Id of PERSONS table)

One restriction is that one person cannot have more than one spouse.
I also thought about adding a field to the PERSONS table specifying his/her
spouse but it seems to me that this approach represents a kind of
"circular" relation between 2 records.

I am writing to ask for advice about an optimal approach to model this
situation.

Respectfully,
Jorge Maldonado

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