Is there any way to delete the contact record associated with a customer portal user?

I'm using a customer portal to self-regiser and authenticate users for a Force.com Site. The self-registration process creates both a user and contact record, as expected, but it seems there's no way to diassociate the contact record from the user record and to delete the contact - even for de-activated users...

Thanks

Is there any way to delete the contact record associated with a customer portal user?

I'm using a customer portal to self-regiser and authenticate users for a Force.com Site. The self-registration process creates both a user and contact record, as expected, but it seems there's no way to diassociate the contact record from the user record and to delete the contact - even for de-activated users...

Thanks